Use of unprotected amino acids in metal-free tandem radical cyclization reactions: Divergent synthesis of 6-alkyl/acyl phenanthridines

Abstract

We reported the first example of the construction of C-C bonds using unprotected amino acids as stable alkyl/acyl radical precursors under metal-free conditions. This novel, environmentally friendly, and one-pot procedure was successfully applied to the radical alkylation or acylation/cyclization of isocyanides, which selectively affords 6-alkyl or acyl phenanthridines, depending on the substituent pattern of amino acid side chain groups.