Alkenylzinc-Mediated Approach to the Vitamin D Skeleton. Application to the Synthesis of 6-Methyl Analogs of Vitamin and Previtamin D
摘要:
Palladium-catalyzed cross-coupling of alkenylzine reagents, bearing the C,D-ring/side chain portion, and (Z)-1-iodo-1,3-bis-exocyclic dienes (as A-ring precursors), provides a mild, convergent entry to the vitamin D skeleton, that is suitable for the synthesis of thermally labile derivatives such as those bearing substituents on the triene system.
Studies on vitamin D (calciferol) and its analogs. 29. Mechanistic studies by deuterium labeling and related kinetic investigations of the [1,5]-sigmatropic hydrogen shift of vitamin D type vinylallenes
作者:Sheri A. Barrack、William H. Okamura
DOI:10.1021/jo00366a025
日期:1986.8
A novel entry to the vitamin D triene system
作者:José L. Mascareñas、Ana Ma Garcia、Luis Castedo、Antonio Mouriño
DOI:10.1016/s0040-4039(00)60832-8
日期:——
The application of Negishi's cyclization methodology to the synthesis of (Z)-1-iodo-1,3-bis-exocyclic-dienes from acyclic precursors is described. This kind of compounds can be used for the preparation of conjugated systems such us the triene of vitamin D.