A novel, efficient, and metal-free dual C–O bond formation reaction for the synthesis of carboxylic anhydrides from aryl aldehydes via cross-dehydrogenative coupling is described. Heating a mixture of aromatic aldehydes and an aqueous solution of tert-butyl hydroperoxide as oxidant in the presence of catalytic nBu4PBr in chlorobenzene at 80 °C for 3 h afforded the corresponding carboxylic anhydrides
描述了一种新颖,有效且无金属的双C-O键形成反应,用于通过交叉脱氢偶联由芳基醛合成羧酸酐。在催化性n Bu 4 PBr在氯苯中的存在下,于80°C加热芳香族醛和氢过氧化叔丁基水溶液作为氧化剂,在80°C下加热3 h,得到相应的羧酸酐,收率良好至优异。
A CONVENIENT METHOD FOR SYNTHESIS OF SYMMETRICAL ACID ANHYDRIDES FROM CARBOXYLIC ACIDS WITH TRICHLOROACETONITRILE AND TRIPHENYLPHOSPHINE
作者:Joonggon Kim、Doo Ok Jang
DOI:10.1081/scc-100000529
日期:2001.1
Various carboxylicacids are converted into the corresponding carboxylicacidanhydrides treated with trichloroacetonitrile and triphenylphosphine in the presence of triethylamine at room temperature.
在室温下,在三乙胺的存在下,各种羧酸被转化为相应的羧酸酐,用三氯乙腈和三苯基膦处理。
A new synthesis of carboxylic and carbonic acid anhydrides using phase transfer reactions
作者:Daniel Plusquellec、Fabienne Roulleau、Martine Lefeuvre、Eric Brown
DOI:10.1016/s0040-4020(01)81698-7
日期:1988.1
liquid-liquid phase transfer conditions to afford high yields of the corresponding symmtrical carboxylic and carbonic hemiester anhydrides. Unstable, anhydrides such as 4-nitrobenzoïc, 2-furoïc and methacrylic anhydrides, which are otherwise difficult to obtain, were easily prepared by this method. The reaction mechanism does not seem to involve intermediate hydrolysis of half the acid chloride into the
Investigation of the Yamaguchi Esterification Mechanism. Synthesis of a Lux-S Enzyme Inhibitor Using an Improved Esterification Method
作者:Ilirian Dhimitruka、John SantaLucia
DOI:10.1021/ol0524048
日期:2006.1.1
[reaction: see text] A one-pot procedure for the regioselective synthesis of aliphaticesters is described. This was a result of a study on mixed aliphatic-aromatic anhydrides. The data suggest that during the Yamaguchi esterification reaction, a symmetric aliphatic anhydride is produced in situ, which upon reaction with an alcohol yields the ester. We confirmed that benzoylchloride could be used
Synthesis of five-membered 2-heteroaryl 2-heteroaromatic carboxylates and attempted cyclization to bisheteroaryl[2,3-<i>b</i>:3′,2′-<i>d</i>]pyran-2-one
作者:Chang Kiu Lee、Ji Sook Yu、Sun Hee Kim
DOI:10.1002/jhet.5570350409
日期:1998.7
2-Heteroaryl2-heteroaromaticcarboxylates were prepared by reactions of 2-heteroaromatic carbonyl chlorides and 2(5H)-furanone, 2(5H)-thiophenone, and 1-methyl-2(5H)-pyrrolone in triethylamine. The 1H nmr spectra of the esters showed that the electronic effect of both heteroaromatic rings did not cause any sizable shift from each other except for 1-methyl-2-pyrrolyl 1-methyl-2-pyrrolecarboxylate (5c)
通过使2-杂芳族羰基氯与2(5 H)-呋喃酮,2(5 H)-噻吩和1-甲基-2(5 H)-吡咯烷在三乙胺中反应制备2-杂芳基2-杂芳族羧酸酯。酯的1 H nmr光谱表明,除了1-甲基-2-吡咯基1-甲基-2-吡咯羧酸酯(5c)以外,两个杂芳族环的电子效应均不会引起任何可观的变化。尝试将酯环化成杂芳基稠合的吡喃-2-酮是不成功的。该结果可以用最稳定的酯构象来解释,其中两个杂原子沿酯基的C 0键为反。