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-closingmetathesis (RCM) reaction or a tandem RCM−isomerization protocol, respectively. The presence of the gem-difluoro moiety in the starting materials exerts