1233510-32-1Relevant articles and documents
Squaramide-Sulfonamide Organocatalyst for Asymmetric Direct Vinylogous Aldol Reactions
Sakai, Takaaki,Hirashima, Shin-ichi,Yamashita, Yoshifumi,Arai, Ryoga,Nakashima, Kosuke,Yoshida, Akihiro,Koseki, Yuji,Miura, Tsuyoshi
, p. 4661 - 4667 (2017/05/12)
Asymmetric direct vinylogous aldol reactions of furan-2(5H)-one with aldehydes in the presence of a catalytic amount of novel squaramide-sulfonamide organocatalyst resulted in the corresponding addition products with high to excellent enantioselectivities. This is the first successful report illustrating an example of highly stereoselective reactions using a squaramide-sulfonamide organocatalyst.
Asymmetric direct vinylogous aldol reaction of unactivated γ-butenolide to aldehydes
Yang, Yang,Zheng, Ke,Zhao, Jiannan,Shi, Jian,Lin, Lili,Liu, Xiaohua,Feng, Xiaoming
supporting information; experimental part, p. 5382 - 5384 (2010/09/05)
(Figure presented) The asymmetric direct vinylogous aldol reaction of unactivated γ-butenolide with aldehydes has been developed, giving the corresponding 5-(1′-hydroxy)butenolide derivatives in high yields (up to 93%) and enantioselectivities (up to 83%
Asymmetric vinylogous aldol reaction of silyloxy furans with a chiral organic salt
Singh, Ravi P.,Foxman, Bruce M.,Deng, Li
supporting information; experimental part, p. 9558 - 9560 (2010/08/20)
Despite their synthetic significance there is a general lack of asymmetric vinylogous aldol reactions that tolerate variations of both the silyloxy furans and aldehydes. We have developed a new chiral organic catalyst based on a carboxylate-ammonium salt prepared from a thiourea-amine and a carboxylic acid. This new catalyst enabled us to develop an efficient asymmetric vinylogous aldol reaction of unprecedented scope with respect to both 2-trimethylsilyloxy furans and aldehydes.