29802-26-4Relevant articles and documents
PD(II)-CATALYZED ENANTIOSELECTIVE C-H ARYLATION OF FREE CARBOXYLIC ACIDS
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Page/Page column 16-17, (2019/11/12)
The invention includes procedures for stereoselective β-arylation of carboxylic acids having a β-carbon atom. For example, stereoselective arylation procedures include the following reactions: (I)
Asymmetric hydroazidation of α-substituted vinyl ketones catalyzed by chiral primary amine
Xue, Zai-Kun,Fu, Nian-Kai,Luo, San-Zhong
supporting information, p. 1083 - 1086 (2017/05/22)
We report herein the first example of asymmetric hydroazidation of α-substituted vinyl ketones by using chiral primary amines as the catalysts. A simple chiral primary-tertiary diamine catalyst derived from L-phenylalanine was found to readily promote this aza-Michael addition reaction with enamine protonation as the key stereogenic step, thus enabling the effective synthesis of α-chiral β-azido ketones with good yields and moderate enantioselectivities.
Novel bifunctional thiourea-ammonium salt catalysts derived from amino acids: Application to highly enantio- and diastereoselective aza-Henry reaction
Wang, Hong-Yu,Chai, Zhuo,Zhao, Gang
supporting information, p. 5104 - 5111 (2013/06/27)
The development of new efficient and easily accessible catalysts has been one of the focuses in asymmetric phase-transfer catalysis. In this paper, a novel class of chiral bifunctional thiourea-ammonium phase-transfer catalysts were synthesized from commercially available α-amino acids. The structural modularity of these catalysts permits facile tunings to achieve optimum results, which was demonstrated in catalyzing the aza-Henry reaction with excellent enantioselectivities (up to 99.5% ee) and diastereoselectivities (up to >25:1 dr).