Palladium(II)-catalyzed claisen rearrangement of allyl vinyl ethers
作者:J.L van der Baan、F Bickelhaupt
DOI:10.1016/s0040-4039(00)85449-0
日期:1986.1
The Claisen rearrangement of allyl vinyl ethers is catalyzed by PdCl2(CH3CN)2, provided that alkyl substituents protect the vinyl ether double bond from coordination by the metal catalyst.
Allenes. Part XVII. The synthesis of allenic cyanohydrins, amino-nitriles, and amino-acids from allenic aldehydes
作者:D. K. Black、S. R. Landor
DOI:10.1039/j39680000281
日期:——
Application of a modified Strecker synthesis to 2,2-dimethylalka-3,4-dienals gives good yields of cyanohydrins, amino-nitriles and amino-acids. Allenic amino-acids are obtained, but only in low yield, from allenic aldehydes with no blocking group in the 2-position.
Preparation of chiral building blocks for the enantioselective total synthesis of ent-kauranoids by the pig liver esterase-catalyzed asymmetric hydrolysis of a dialkyl malonate-type prochiral diester
作者:Yuji Namiki、Tomohiro Fujii、Masahisa Nakada
DOI:10.1016/j.tetasy.2014.01.019
日期:2014.5
The preparation of chiral building blocks, suitable for use in the enantioselective total synthesis of kauranoids and ent-kauranoids, is reported herein. The pig liver esterase-catalyzed asymmetric hydrolysis of dimethyl 3,3-dimethyl-2-methylenecyclohexane-1,2-dicarboxylate, a malonate-type prochiral diester, afforded the corresponding half-ester in 96% yield and with 99% enantiomeric excess. The absolute configuration of the half-ester was determined by X-ray crystallographic analysis of its derivative and its enantiodivergent transformations are also described herein. (C) 2014 Elsevier Ltd. All rights reserved.