Nucleophilic Acyl Substitution via Aromatic Cation Activation of Carboxylic Acids: Rapid Generation of Acid Chlorides under Mild Conditions
作者:David J. Hardee、Lyudmila Kovalchuke、Tristan H. Lambert
DOI:10.1021/ja101292a
日期:2010.4.14
occurs rapidly in the presence of 3,3-dichlorocyclopropenes via the intermediacy of cyclopropenium carboxylate complexes. The effect of cyclopropene substituents on the rate of conversion is examined. The addition of tertiary amine base is found to dramatically accelerate reaction, and conditions were developed for the preparation of acid sensitive acid chlorides. Preparative scale peptide couplings of
已实现芳香族阳离子活化亲核酰基取代的第一个实例。在 3,3-二氯环丙烯的存在下,通过环丙烯鎓羧酸盐络合物的中介作用,羧酸迅速转化为其相应的酰氯。检查了环丙烯取代基对转化率的影响。发现叔胺碱的加入显着加速了反应,并开发了制备酸敏感酰氯的条件。用这种方法实现了两个 N-Boc 氨基酸的制备规模的肽偶联。