3 (C) -Acylation of 3-unsubstituted tetramic acids with carboxylic acid has been achieved by two sequential reactions in one flask : (1) 4 (O) -acylation in the presence of DCC and a catalytic amount of DMAP, and (2) 4 (O) →3 (C) acyl-migration promoted by adding Et3N.
                                    3 (C) -未取代的四
氟酸与
羧酸的酰化反应已通过在一个烧瓶中进行的两步连续反应实现: (1) 在
DCC和催化量
DMAP存在下进行4 (O) -酰化; (2) 通过加入Et3N促进4 (O) → 3 (C) 酰基迁移。