Cis Selective Wittig Olefination of α-Alkoxy Ketones and Its Application to the Stereoselective Synthesis of Plaunotol
作者:Seiichi Inoue、Kiyoshi Honda、Norimichi Iwase、Kikumasa Sato
DOI:10.1246/bcsj.63.1629
日期:1990.6
Several Wittigolefinations between α-heterosubstituted acetones and a phosphorus ylide were investigated concerning the product stereoselectivity. Benzyloxyacetone and tetrahydropyranyloxyacetone furnished trisubstituted (Z)-olefins exclusively. The stereoselective preparation of oxygenated acyclic terpenoids was practical by use of the direct Wittigolefination toward α-alkoxy ketones, and it facilitated
A potent antipeptic ulcer substance, acyclic diterpene alcohol, was isolated from a Thai medicinal plant identified with Croton sublyratus KURZ. The structure was determined by the spectral data and stereospecific synthesis to be (E, Z, E)-7-hydroxymethyl-3, 11, 15-trimethyl-2, 6, 10, 14-hexadecatetraen-1-ol.
从一种泰国药用植物 Croton sublyratus KURZ 中分离出一种强效抗消化性溃疡物质--无环二萜醇。通过光谱数据和立体特异性合成,确定其结构为(E,Z,E)-7-羟甲基-3,11,15-三甲基-2,6,10,14-十六碳四烯-1-醇。
Highly Stereoselective Total Synthesis of Plaunotol
Highlystereoselectivetotalsynthesis of plaunotol has been achieved by the application of the (Z)-stereoselective direct Wittig olefination to α-alkoxy ketones having geranyl-acetone skeleton.