Stereocontrolled Elongation of a Functionalized Isoprene Unit on the<i>E</i>or<i>Z</i>Terminal Methyl of Terpenoids<i>via</i><i>N</i>-Ylide Rearrangement of the Common Ammonium Salts
作者:Kiyoshi Honda、Masayuki Tabuchi、Seiichi Inoue
DOI:10.1246/cl.1996.385
日期:1996.5
Stereocontrolled elongation of a functionalized isoprene unit on the E or Z terminal methyl of terpenoids was achieved by the N-ylide rearrangement of the common ammonium salts under the selected reaction conditions. One of rearrangement products, all-(E)-sesquiterpene carboxylate was converted into β-sinensal, a component of the essential oil of Chinese orange. General aspects of these transformations were described.
在选定的反应条件下,通过普通铵盐的 N-酰化重排,实现了萜类化合物 E 或 Z 端甲基上的官能化异戊二烯单元的立体可控伸长。重排产物之一,全-(E)-倍半萜羧酸酯被转化成了中国橘子精油的一种成分--β-西尼萨。对这些转化的一般方面进行了描述。
Stereocontrolled synthesis of acyclic terpenoids via N-ylide [2,3]rearrangement of ammonium salts with the stereodefined isoprene unit
of a functionalized isopreneunit on the E or Z terminal methyl of terpenoids was achieved by N-ylide rearrangement of the common ammonium salts under selected reaction conditions. A 1,5-diene or conjugated triene skeleton can be furnished by reductive or oxidative removal of the amino group of the rearrangement product, respectively. As an application to natural-product synthesis, all-(E)-terpenoid