An Enantioselective Biginelli Reaction Catalyzed by a Simple Chiral Secondary Amine and Achiral Brønsted Acid by a Dual-Activation Route
作者:Junguo Xin、Lu Chang、Zongrui Hou、Deju Shang、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/chem.200701581
日期:2008.3.27
An enantioselective Biginelli reaction that proceeds by a dual-activation route has been developed by using a combined catalyst of a readily available trans-4-hydroxyproline-derived secondary amine and a Bronsted acid. Aromatic, heteroaromatic, and fused-ring aldehydes were found to be suitable substrates for this multicomponent reaction. The corresponding dihydropyrimidines were obtained in moderate-to-good
通过使用容易获得的反式4-羟基脯氨酸衍生的仲胺和布朗斯台德酸的组合催化剂,已经开发了通过双活化途径进行的对映选择性比吉内利反应。发现芳族,杂芳族和稠环醛是该多组分反应的合适底物。在温和条件下,以中等至良好的收率获得了相应的二氢嘧啶,收率高达98%ee。根据实验结果和观察到的产物的绝对构型,提出了一个合理的过渡态来解释激活和不对称诱导的起源。