Stereocontrolled synthesis of acyclic terpenoids via N-ylide [2,3]rearrangement of ammonium salts with the stereodefined isoprene unit
作者:Kiyoshi Honda、Masayuki Tabuchi、Hiroki Kurokawa、Masatoshi Asami、Seiichi Inoue
DOI:10.1039/b201304e
日期:2002.5.23
of a functionalized isoprene unit 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
在选定的反应条件下,通过常见铵盐的N-内酯重排,可以实现萜类化合物E或Z末端甲基上官能化异戊二烯单元的立体控制伸长。可以分别通过还原或氧化去除重排产物的氨基来提供1,5-二烯或共轭三烯骨架。作为应用程序,以天然产物的合成,清一色(ë)-terpenoid(ë) - 11D和(E,Z)-terpenoid(Ž) - 11C转化成β -sinensal和(13 ž)-视黄醇。讨论了这些变换的一般方面以及N ylide重排的合理过渡态。