Methods for the synthesis of lactams are presented whereby a carboxylic acid of the formula HOOC—OR—NH-LG, wherein OR is an organic moiety and LG is a leaving group, is reacted with an acid, such as an organic acid, in particular a strong acid, and a dehydrating agent, which may be one in the same such as a strong acid anhydride, such that the amount of acid added allows for the desired transformation to take place without the loss of the leaving group (LG) before the cyclization, and recovering the lactam.
本发明提出了合成内酰胺的方法,即将式 HOOC-OR-NH-LG(其中 OR 为有机分子,LG 为离去基团)的
羧酸与一种酸(如有机酸,特别是强酸)和一种脱
水剂(可以是同一种脱
水剂,如强酸酸酐)反应,使加入的酸量能够在环化前发生所需的转化而不损失离去基团(LG),从而回收内酰胺。