Radical cyclisations of propargyl bromoamides and propargyl bromoesters. New routes to tetramic acids, pyrrolinones, tetronic acids and butenolides

Article abstract of DOI:10.1016/S0040-4039(00)70728-3

Radical cyclisations of the propargyl bromoamides (5) and (9), and the propargyl bromoesters (17) and (21a-e), produce precursors viz (6), (10), (18) and (22), to the tetramic acids (8) and (12), the pyrrolinones (7) and (11), the tetronic acids (20) and