Stereoselective synthesis of 2,6-<i>trans</i>-4-oxopiperidines using an acid-mediated 6-<i>endo-trig</i> cyclisation
作者:Jonathan D. Bell、Alexander H. Harkiss、Christopher R. Wellaway、Andrew Sutherland
DOI:10.1039/c8ob01363b
日期:——
An acid-mediated 6-endo-trig cyclisation of amine-substituted enones has been developed for the stereoselective synthesis of trans-6-alkyl-2-methyl-4-oxopiperidines. Performed under conditions that prevent removal of the Boc-protecting group or acetal formation, the key cyclisation was found to generate cleanly the 4-oxopiperidine products in high overall yields from a wide range of alkyl substituted