Catalytic hetero-ene reactions of 5-methyleneoxazolines: highly enantioselective synthesis of 2,5-disubstituted oxazole derivatives
作者:Weiwei Luo、Jiannan Zhao、Chengkai Yin、Xiaohua Liu、Lili Lin、Xiaoming Feng
DOI:10.1039/c4cc02809k
日期:——
An efficient catalytic asymmetric hetero-ene reaction of 5-methyleneoxazolines with 1,2-dicarbonyl compounds (including α-ketoesters and glyoxal derivatives) was realized using Ni(II)–N,N′-dioxide complexes as the catalysts. It provides a rapid, high yielding (up to 99%) route for the preparation of 2,5-disubstituted oxazole derivatives in a highly enantioenriched form (up to >99% ee) under mild conditions.
一种高效的催化不对称异核烯反应被实现,涉及5-亚甲基噻唑啉与1,2-二酮化合物(包括α-酮酯和乙醛衍生物),使用Ni(II)–N,N′-二氧化物复合物作为催化剂。该方法在温和条件下提供了一条快速、高产率(高达99%)的途径,用于制备2,5-二取代噻唑衍生物,并且具有高度的对映体丰度(高达>99% ee)。