Borane-Methyl Sulfide Reductive Cyclization of ω-Ester Alkylamides: A Convenient Synthesis of<i>N</i>-Substituted Cyclic Amines
作者:Michael C. Venuti、Oswald Ort
DOI:10.1055/s-1988-27777
日期:——
Borane-methyl sulfide (BMS) reduction of variously N-substituted succinamic and glutaramic esters affords the corresponding N-substituted pyrrolidines and piperidines in high yields. The limitations, mainly caused by steric hinderance around the amine nitrogen, and putative intermediates involved in this conversion, as detected by incomplete reaction and/or synthesis followed by BMS reduction, indicate that cyclization and amide reduction successfully compete with ester reduction to afford the N-substituted cyclized amines.