Role of the <i>g</i><i>em</i>-Difluoro Moiety in the Tandem Ring-Closing Metathesis−Olefin Isomerization: Regioselective Preparation of Unsaturated Lactams
作者:Santos Fustero、María Sánchez-Roselló、Diego Jiménez、Juan F. Sanz-Cervera、Carlos del Pozo、José Luis Aceña
DOI:10.1021/jo0525635
日期:2006.3.31
Careful selection of the metathesis catalyst, solvent, and reaction conditions allows for the efficient and regioselective synthesis of isomeric fluorinated and nonfluorinated lactam derivatives II and III from precursor amides I through a ring-closing metathesis (RCM) reaction or a tandem RCM−isomerization protocol, respectively. The presence of the gem-difluoro moiety in the starting materials exerts
仔细选择复分解催化剂,溶剂和反应条件,可以通过闭环复分解(RCM)反应或串联RCM异构化协议从前体酰胺I高效且区域选择性地合成异构的氟化和非氟化内酰胺衍生物II和III。, 分别。起始物中的宝石-二氟部分的存在通过指导异构化步骤发挥关键作用,从而使整体串联转化成为区域选择性过程。还讨论了该协议的范围,局限性和综合实用性。