Tandem RCM−Isomerization− Cyclopropanation Reactions

Abstract

A new triple tandem process has been discovered in which simple acyclic substrates can be transformed into bicyclic compounds via RCM-double bond isomerization-cyclopropanation. This process is catalyzed by second generation Grubb's catalyst without the requirement of other reactives or additives. In addition, a one-pot RCM-isomerization reaction followed by cyclopropanation with CHCl3/NaOH allows the synthesis of products related to iNOS (nitric oxide synthase) inhibitors, which are currently under clinical evaluation.