Tert-Butyldiphenylsilylmethyl Triflate: Preparation and Dipolar Cycloaddition Reactions of 1-(Tert-Butyldiphenylsilylmethyl)-6-Cyano-4-Methyl-1,2,5,6-Tetrahydropyridine

Abstract

Alkylation of substituted pyridines with tert-butyldiphenylsilylmethyl triflate provides N-[tert-butyldiphenylsilylmethyl]pyridinium triflates in excellent yields. Reductive cyanation of the pyridinium triflates provides 1-(tert-butyldiphenylsilylmethyl)-6-cyano-1,2,5,6-tetrahydropyridines, azomethine ylid precursors, in modest yields. An unexpected dipolar cycloaddition reaction of an ylid derived from the title 6-cyanopiperidine is described.