Dieckmann-type cyclization reactions of various dicarboxylic acid derivatives were readily promoted by employing Lewis acids such as AlCl3, MgBr2, MgCl2, and Sn(OSO2CF3)2 in the presence of Et3N or N-ethylpiperidine. The cyclization reactions of half thiol diesters under the AlCl3-Et3N conditions exhibited different chemoselectivity from the cyclization under the basic conditions.
Dieckmann型环化反应通过使用Lewis酸如
AlCl3、MgBr2、MgCl2和Sn(OSO2CF3)2,在Et3N或
N-乙基哌啶的存在下,能够轻松促进各种二
羧酸衍
生物的反应。在 -Et3N条件下,半
硫酯的环化反应表现出与碱性条件下不同的
化学选择性。