Radical cyclisations of propargyl bromoamides and propargyl bromoesters. New routes to tetramic acids, pyrrolinones, tetronic acids and butenolides
作者:John M. Clough、Gerald Pattenden、Paul G. Wight
DOI:10.1016/s0040-4039(00)70728-3
日期:1989.1
Radical cyclisations of the propargyl bromoamides (5) and (9), and the propargyl bromoesters (17) and (21-), produce precursors (6), (10), (18) and (22), to the tetramic acids (8) and (12), the pyrrolinones (7) and (11), the tetronic acids (20) and (23), and the butenolides (19) and 24), in high overall yields.