Towards the total synthesis of phorboxazoles A and B: Stereocontrolled synthesis of a C20C32 subunit
作者:Ian Paterson、Euan A. Arnott
DOI:10.1016/s0040-4039(98)01539-1
日期:1998.9
The C20C32 phorboxazole subunit 4, containing 5 stereocentres, was prepared in 8 steps (34%) from ethyl ketone (S)-7. Key steps included a boron-mediated anti aldol reaction and an intramolecular hetero-Michael reaction. Installation of the C19C20(E)-alkene using a Wittig reaction produced a C15C32 fragment, including both oxazoles present in the natural product.
的C 20 C 32 phorboxazole亚基4,含有5个立体中心,在从乙基酮(8步(34%),制备小号- )7。关键步骤包括硼介导的抗羟醛反应和分子内异迈克尔反应。使用Wittig反应安装C 19 = C 20(E)-烯烃会产生C 15 = C 32片段,包括天然产物中存在的两种恶唑。