Synthesis of bicyclic carbamates as precursors of Sedum alkaloid derivatives
Synthesis of a N-Boc-protected piperidin-2-yl phosphine oxide starting from piperidine in three steps, followed by olefination using a variety of α,β-unsaturated aldehydes resulted in tert-butyl 2-(2′- alkenylidene)piperidine-1-carboxylates in high yields