Abstract:
Pd/Lewis acid-catalyzed reactions of bicyclic hydrazines with organostannanes afforded the 3,4-disubstituted cyclopentenes in excellent yields. The reaction is milder and is the first general methodology developed for the stereoselective synthesis of trans, vicinal disubstituted cyclopentenes. The results show that organostannanes with easily functionalizable moieties can be efficiently utilized in the ring opening of bicyclic hydrazines leading to the stereoselective formation of 3,4-disubstituted cyclopentenes. The products, having a wide range of substituents, are important intermediates in the synthesis of biologically active molecules like cyclopentenyl nucleosides, glycosidase inhibitors etc.
