Concise and scalable asymmetric synthesis of 5-(1-amino-2,2,2-trifluoroethyl)thiazolo[3,2-b][1,2,4]triazoles
作者:Haibo Mei、Yiwen Xiong、Chen Xie、Vadim A. Soloshonok、Jianlin Han、Yi Pan
DOI:10.1039/c3ob42348d
日期:——
This study describes asymmetric Mannich-type additions between C-5 lithiated thiazolo[3,2-b][1,2,4]triazoles and enantiomerically pure (SS)-N-tert-butanesulfinyl-(3,3,3)-trifluoroacetaldimine. Under the optimized conditions, these reactions proceed with good (up to 78%) chemical yields and virtually complete (98 : 2 to >99 : 1 dr) diastereoselectivity. The same stereochemical outcome was obtained using
这项研究描述了C-5锂化的噻唑并[3,2- b ] [1,2,4]三唑与对映体纯的(S S)-N-叔-丁亚磺酰基-(3,3,3)之间的不对称曼尼希型加成反应。-三氟乙二胺。在优化的条件下,这些反应以良好的化学产率(高达78%)进行,并且几乎完成了非对映选择性(98:2至> 99:1 dr)。使用1.05 g规模的起始(3,3,3)-三氟乙醛亚胺可获得相同的立体化学结果。这项工作中开发的方法提供了简明和通用的方法,可用于含有手性(三氟)乙胺基的噻唑并[3,2- b ] [1,2,4]三唑。