Synthesis of polyfunctional aliphatic carbonyl compounds under phase-transfer conditions
摘要:
We have studied mono- and dialkylation of malonic, acetoacetic, and cyanoacetic esters with esters of haloacetic and beta-halopropionic acids and addition of the CH acids mentioned and their analogs to methyl and ethyl acrylate under phase-transfer catalysis conditions, and also deethoxycarbonylation of the obtained products. We have demonstrated for the first time the possibility of Dieckmann cyclization under phase-transfer catalysis conditions and have developed a simple method for the synthesis of 2,3-di(ethoxycarbonyl)cyclopentanone, a key intermediate in the syntheis of deoxyprostaglandins, by cyclization of triethyl 1,2,4-butanetricarboxylate.
Synthesis of polyfunctional aliphatic carbonyl compounds under phase-transfer conditions
摘要:
We have studied mono- and dialkylation of malonic, acetoacetic, and cyanoacetic esters with esters of haloacetic and beta-halopropionic acids and addition of the CH acids mentioned and their analogs to methyl and ethyl acrylate under phase-transfer catalysis conditions, and also deethoxycarbonylation of the obtained products. We have demonstrated for the first time the possibility of Dieckmann cyclization under phase-transfer catalysis conditions and have developed a simple method for the synthesis of 2,3-di(ethoxycarbonyl)cyclopentanone, a key intermediate in the syntheis of deoxyprostaglandins, by cyclization of triethyl 1,2,4-butanetricarboxylate.
Preparation of Diversely Substituted Triarylmethyl Radicals by the Quenching of Tris(2,3,5,6-tetrathiaaryl)methyl Cations with C-, N-, P-, and S-Nucleophiles
作者:Victor M. Tormyshev、Olga Yu. Rogozhnikova、Michael K. Bowman、Dmitry V. Trukhin、Tatiana I. Troitskaya、Vladimir G. Vasiliev、Leonid A. Shundrin、Howard J. Halpern
DOI:10.1002/ejoc.201301161
日期:2014.1
C-, N-, P-, and S-nucleophiles reacted with symmetrical tris(2,3,5,6-tetrathiaaryl)methylcations, generated from the corresponding triarylmethanols by strong acids, to give a variety of asymmetrical monosubstituted persistent triaryl-methyl (TAM) radicals as the major products. The only byproducts were symmetrical TAMs.
Synthesis of Cyclopentenes, Pyrroles, and Thiophenes via a Sequence of Propargyl–Allenyl Isomerizations, Michael Additions, and Intramolecular Wittig Reactions
作者:Guoqing Zhao、Qianyun Zhang、Hongwei Zhou
DOI:10.1021/jo501867h
日期:2014.11.21
simple, readily available propargylphosphonium salts through propargyl–allenyl isomerization. We developed an efficient synthesis for cyclopentenes, pyrroles, and thiophenes via a sequence of propargyl–allenyl isomerizations, Michael additions, and intramolecular Wittig reactions.