Showing posts with label NMR. Show all posts
Showing posts with label NMR. Show all posts

Tuesday, 4 April 2017

Palladium-catalyzed coupling of azoles with 1-aryltriazenes via C–H/C–N cleavage

 

Palladium-catalyzed coupling of azoles with 1-aryltriazenes via C–H/C–N cleavage

*Corresponding authors

Abstract

In the presence of CuCl and ButOLi, PdCl2/dppe catalyzes the reaction of (benzo)oxazoles or (benzo)thiazoles with 1-aryltriazenes to yield arylated products of (benzo)oxazoles or (benzo)thiazoles. Functional groups including F, Cl, CF3, COOEt, CN, OMe, NMe2, Py, and thienyl groups can be tolerated.
Graphical abstract: Palladium-catalyzed coupling of azoles with 1-aryltriazenes via C–H/C–N cleavage

Regioselective acylation and carboxylation of [60]fulleroindoline via electrochemical synthesis

    str5
3a (11.2 mg, 38%) were obtained along with unreacted 1 (1.1 mg, 4%).
1H NMR (400 MHz, CS2/CDCl3) δ 8.39 (d, J = 8.0 Hz, 2H), 7.60 (t, J = 7.4 Hz, 1H), 7.50 (t, J = 7.7 Hz, 2H), 7.41 (d, J = 7.8 Hz, 1H), 7.29 (s, 1H), 7.04 (d, J = 7.8 Hz, 1H), 5.95 (s, 1H), 2.76 (s, 3H), 2.52 (s, 3H);
13C NMR (100 MHz, CS2/CDCl3, all 1C unless indicated) δ 196.06 (C=O), 167.78 (C=O), 152.39, 152.08, 151.38, 150.04, 149.83, 149.22, 148.81, 148.52, 148.26, 147.93, 147.86, 147.73, 147.36, 147.18, 147.14 (2C), 146.91, 146.86, 146.41, 146.40, 145.99 (2C), 145.95, 145.92, 145.53, 145.37, 145.33, 144.82 (2C), 144.80, 144.72, 144.54, 144.42, 144.31, 144.14, 143.84, 143.65, 143.42, 143.31, 143.05, 142.13, 141.93, 141.79, 141.72 (2C), 141.69, 141.55, 141.35, 141.24, 141.10, 140.63, 140.14, 139.93 (aryl C), 138.84, 137.70, 137.54 (aryl C), 137.47, 137.38, 135.44 (aryl C), 133.14 (aryl C), 129.16 (2C, aryl C), 128.72 (2C, aryl C), 128.61 (aryl C), 125.80 (aryl C), 125.42 (aryl C), 115.11 (aryl C), 83.58 (sp3 -C of C60), 69.89 (sp3 -C of C60), 62.42 (sp3 -C of C60), 56.81 (sp3 -C of C60), 26.84, 22.25;
UV-vis (CHCl3) λmax nm (log ε) 251.0 (5.1), 318.5 (4.6), 403.5 (4.0), 440.0 (3.9), 525.5 (3.2), 703.5 (2.5);
FT-IR ν/cm-1 (KBr) 2922, 2860, 1668, 1599, 1499, 1439, 1366, 1304, 1236, 1180, 1086, 1020, 964, 858, 802, 748, 691, 604, 528;
MALDI-TOF MS m/z calcd for C76H16NO2 [M+H]+ 974.1176, found 974.1165.

Regioselective acylation and carboxylation of [60]fulleroindoline via electrochemical synthesis

Abstract

A regioselective and highly efficient electrochemical method for direct acylation and carboxylation of a [60]fulleroindoline has been developed. By using inexpensive and readily available acyl chlorides and chloroformates, both keto and ester groups can be easily attached onto the fullerene skeleton to afford 1,2,3,16-functionalized [60]fullerene derivatives regioselectively. In addition, a plausible mechanism for the formation of fullerenyl ketones and esters is proposed, and their further transformations under basic and acidic conditions have been investigated.

Regioselective acylation and carboxylation of [60]fulleroindoline via electrochemical synthesis

    str5
3a (11.2 mg, 38%) were obtained along with unreacted 1 (1.1 mg, 4%).
1H NMR (400 MHz, CS2/CDCl3) δ 8.39 (d, J = 8.0 Hz, 2H), 7.60 (t, J = 7.4 Hz, 1H), 7.50 (t, J = 7.7 Hz, 2H), 7.41 (d, J = 7.8 Hz, 1H), 7.29 (s, 1H), 7.04 (d, J = 7.8 Hz, 1H), 5.95 (s, 1H), 2.76 (s, 3H), 2.52 (s, 3H);
13C NMR (100 MHz, CS2/CDCl3, all 1C unless indicated) δ 196.06 (C=O), 167.78 (C=O), 152.39, 152.08, 151.38, 150.04, 149.83, 149.22, 148.81, 148.52, 148.26, 147.93, 147.86, 147.73, 147.36, 147.18, 147.14 (2C), 146.91, 146.86, 146.41, 146.40, 145.99 (2C), 145.95, 145.92, 145.53, 145.37, 145.33, 144.82 (2C), 144.80, 144.72, 144.54, 144.42, 144.31, 144.14, 143.84, 143.65, 143.42, 143.31, 143.05, 142.13, 141.93, 141.79, 141.72 (2C), 141.69, 141.55, 141.35, 141.24, 141.10, 140.63, 140.14, 139.93 (aryl C), 138.84, 137.70, 137.54 (aryl C), 137.47, 137.38, 135.44 (aryl C), 133.14 (aryl C), 129.16 (2C, aryl C), 128.72 (2C, aryl C), 128.61 (aryl C), 125.80 (aryl C), 125.42 (aryl C), 115.11 (aryl C), 83.58 (sp3 -C of C60), 69.89 (sp3 -C of C60), 62.42 (sp3 -C of C60), 56.81 (sp3 -C of C60), 26.84, 22.25;
UV-vis (CHCl3) λmax nm (log ε) 251.0 (5.1), 318.5 (4.6), 403.5 (4.0), 440.0 (3.9), 525.5 (3.2), 703.5 (2.5);
FT-IR ν/cm-1 (KBr) 2922, 2860, 1668, 1599, 1499, 1439, 1366, 1304, 1236, 1180, 1086, 1020, 964, 858, 802, 748, 691, 604, 528;
MALDI-TOF MS m/z calcd for C76H16NO2 [M+H]+ 974.1176, found 974.1165.

Regioselective acylation and carboxylation of [60]fulleroindoline via electrochemical synthesis

Abstract

A regioselective and highly efficient electrochemical method for direct acylation and carboxylation of a [60]fulleroindoline has been developed. By using inexpensive and readily available acyl chlorides and chloroformates, both keto and ester groups can be easily attached onto the fullerene skeleton to afford 1,2,3,16-functionalized [60]fullerene derivatives regioselectively. In addition, a plausible mechanism for the formation of fullerenyl ketones and esters is proposed, and their further transformations under basic and acidic conditions have been investigated.

1,5-bis-(2-furanyl)-1,4-pentadien-3-one (FAF)

A catalytic aldol condensation system enables one pot conversion of biomass saccharides to biofuel intermediates

Abstract

Producing bio-intermediates from lignocellulosic biomass with minimal process steps has a far-reaching impact on the biofuel industry. We studied the metal chloride catalyzed aldol condensation of furfural with acetone under conditions compatible with the upstream polysaccharide conversions to furfurals. In situ far infrared spectroscopy (FIR) was applied to guide the screening of aldol condensation catalysts based on the distinguishing characteristics of metal chlorides in their coordination chemistries with carbonyl-containing compounds. NiCl2, CoCl2, CrCl3, VCl3, FeCl3, and CuCl2 were selected as the potential catalysts in this study. The FIR results further helped to rationalize the excellent catalytic performance of VCl3 in furfural condensation with acetone, with 94.7% yield of biofuel intermediates (C8, C13) in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) solvent. Remarkably, addition of ethanol facilitated the acetal pathway of the condensation reaction, which dramatically increased the desired product selectivity over the furfural pathway. Most significantly, we demonstrate for the first time that VCl3 catalyzed aldol condensation in acidic medium is fully compatible with upstream polysaccharide hydrolysis to monosaccharide and the subsequent monosaccharide isomerization and dehydration to furfurals. Our preliminary results showed that a 44% yield of biofuel intermediates (C8, C13) can be obtained in one-pot conversion of xylose catalyzed by paired metal chlorides, CrCl2 and VCl3. A number of prior works have shown that the biofuel intermediates derived from the one-pot reaction of this work can be readily hydrogenated to biofuels.
Graphical abstract: A catalytic aldol condensation system enables one pot conversion of biomass saccharides to biofuel intermediates
1,5-bis-(2-furanyl)-1,4-pentadien-3-one (FAF)
FAF is a yellow solid.1H NMR (400 MHz, CDCl3, TMS) δ 7.51 – 7.46 (m, 4H), 6.92 (d, J = 15.6 Hz, 2H), 6.69 (d, J = 3.4 Hz, 2H), 6.50 – 6.49 (m, 2H);13C NMR (100 MHz, CDCl3) δ 188.1, 151.6, 144.9, 129.2, 123.2, 115.8, 112.6

Tuesday, 21 March 2017

2-({3-Methyl-6-[(3R)-3-piperidinylamino]-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl}methyl)-4-fluorobenzonitrile

 

Figure
2-({3-Methyl-6-[(3R)-3-piperidinylamino]-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl}methyl)-4-fluorobenzonitrile (8)
Mp: 90 °C decomposed.
 
1H NMR (400 MHz, CD3OD) δ (ppm): 7.85–7.89 (m, 1H), 7.25–7.28 (m, 1H), 6.96–6.99 (m, 1H), 5.37–5.51 (m, 2H), 4.84 (s, 1H), 3.42–3.49 (m, 1H), 3.28 (s, 3H), 3.11–3.15 (m, 1H), 2.89–2.93 (m, 1H), 2.46–2.58 (m, 2H), 1.92–1.95 (m, 1H), 1.48–1.70 (m, 3H).
 
MS (ESI+): m/z, 358.06 ([M + H]+).

Friday, 6 March 2015

7-allyl-6-hydroxy-indan-1-one...Mom will teach you NMR

Figure US08242291-20120814-C00009


Thermal Claisen rearrangement on 6-allyloxy-indan-1-one,  (III) to obtain 7-allyl-6-hydroxy-indan-1-one, (IV):
  • Formula: C12H12O2
  • Molecular Weight: 188.22200
Synonyms:



http://www.google.com/patents/US8242291
EXAMPLE 2
This example refers to reaction b of the process of the invention.
20 kg of the intermediate of formula (III) prepared as described in example 1 are suspended in 50 l of Dowtherm A under nitrogen flow. In an inert atmosphere, it is heated to approximately 200° C. for approximately 5 hours. Upon completion of the reaction (TLC) a clear red-brown solution is obtained, without the formation of black pitch. The reaction mixture is cooled slowly to 25° C. (a partial precipitation is observed). 100 l (5 volumes) of cyclohexane are added and it is cooled to between 0 and 5° C. for one hour. It is filtered by washing with cyclohexane and dried at reduced pressure and T=45° C. for at least 12 hours. 16.8 kg of yellow solid are obtained which is refluxed in 80 l of toluene in the presence of decolouring carbon. The suspension is filtered, washing it with hot toluene. Part of the solvent is distilled at reduced pressure until the beginning of crystallisation. It is cooled at room temperature and then to between 0 and 5° C. for at least one hour.
The filtered solid is washed with cold toluene and dried at reduced pressure at T=45° C. for at least 12 hours. 15.3 kg of intermediate (IV) are obtained in the form of an almost white solid of quality suitable for continuation of the synthesis.
1H-NMR and mass spectroscopic analyses are performed on part of the product thus obtained, purified by chromatography for analytical purposes (silica gel, 7 parts in volume of heptane—3 parts in volume of ethyl acetate), obtaining the following results:
Electron impact mass: [M+]=188
1H-NMR (500 MHz, CDCl3): δ (ppm)
2.72 ppm, t, J=6 Hz, 2H,  AR C=OCH2 CH2 AR
3.03 ppm, t, J=6 Hz, 2H, AR C=OCH2 CH2 AR
4.03 ppm, d, J=6 Hz, 2H, ARCH2CH=CH2
5.13-5.20, Σd, 2H, ARCH2CH=CH2
5.60 ppm, s, 1H, 0H
5.98-6.10 ppm, m, 1H, CH2CH=CH2
7.13 ppm, d, J=8 Hz, 1H, AR
7.25, d, J=8 Hz, 1H. AR

PREDICT
1H NMR

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6-hydroxy-7-prop-2-enyl-2,3-dihydroinden-1-one NMR spectra analysis, Chemical CAS NO. 320574-77-4 NMR spectral analysis, 6-hydroxy-7-prop-2-enyl-2,3-dihydroinden-1-one H-NMR spectrum




13 C NMR

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6-hydroxy-7-prop-2-enyl-2,3-dihydroinden-1-one NMR spectra analysis, Chemical CAS NO. 320574-77-4 NMR spectral analysis, 6-hydroxy-7-prop-2-enyl-2,3-dihydroinden-1-one C-NMR spectrum

6-hydroxy-7-prop-2-enyl-2,3-dihydroinden-1-one

COSY PREDICT


HMBC PREDICT

................ 
COCK SAYS MOM CAN TEACH YOU NMR


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Khajuraho Group of Monuments is located in India
Khajuraho Group of Monuments
Location of Khajuraho Group of Monuments in India.

Location in Madhya PradeshLocation in Madhya Pradesh

  1. Khajuraho Group of Monuments - Wikipedia, the free ...

    en.wikipedia.org/wiki/Khajuraho_Group_of_Monuments

    The Khajuraho Group of Monuments are a group of Hindu and Jain temples in Madhya Pradesh, India. About 620 kilometres (385 mi) southeast of New Delhi, ...























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