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
Formation of Enol Ethers by Radical Decarboxylation of α-Alkoxy β-Phenylthio Acids
作者:Ashokkumar Palanivel、Sidra Mubeen、Thomas Warner、Nayeem Ahmed、Derrick L. J. Clive
DOI:10.1021/acs.joc.9b02042
日期:2019.10.4
decarboxylation of α-alkoxy β-phenylthio acids via the corresponding Barton esters. The phenylthio acids were usually made by the known regioselective reaction of α,β-epoxy acids with PhSH in the presence of InCl3, followed by O-alkylation of the resulting alcohol. In one case, thiol addition to an α,β-unsaturated ethoxymethyl ester was used.