The oxidative radical cyclization of active methylene derivatives containing allyl groups as radical acceptors proceeded with the use of FeCl3 as a mild oxidant. The FeCl3-promoted cyclization reactions of α-substituted active methylene compounds provide a synthetic approach to various γ-lactams containing a quaternary carbon atom.
A one step synthesis of functionalized lactams and spirolactams from unsaturated β-Ketoamides
作者:J. Cossy、A. Thellend
DOI:10.1016/s0040-4039(00)88823-1
日期:1990.1
Treatment of N,N-diallyl and N-alkyl, N-propargyl-β-ketoamides with NaH and then with N-iodosuccinimide led to the formation of iodomethyl- and iodomethylene-β-ketolactams.
Photoreductive cyclization of N,N-dialkyl-β-oxoamides: synthesis of piperidines and δ-lactams
作者:Janine Cossy、Damien Belotti、Nguyen Kim Cuong、Claude Chassagnard
DOI:10.1016/s0040-4020(01)87244-6
日期:1993.8
The photoreductive cyclization of N,N-unsaturated dialkyl-beta-oxoamides produced delta-lactams in good yields. On the contrary the photoreductive cyclization of N,N-unsaturated dialkyl-beta-aminoketones produced substituted piperidines in poor yields.
Metallic Salt Promoted Radical Cyclization of β-Keto Carboxamides and Their Corresponding β-Enamino Carboxamides
Substituted lactams and spirolactams were obtained by Mn(III)-induced radical cyclization of unsaturated beta -keto carboxamides. Treatment of the corresponding tertiary enamines under similar reaction conditions and in the presence of K2CO3 afforded the same cyclized products but with inversion of diastereoselectivity. The oxidation of optically pure secondary enamines leads to diastereomeric spirolactams in an approximately 3:1 ratio.
New synthesis of lactams and spirolactams radical cyclization induced by manganese(III) acetate