Organocatalytic Asymmetric Synthesis of Benzothiazolopyrimidines via [4 + 2] Cyclization of 2-Benzothiazolimines and Aldehydes
作者:Xue-Ping Chen、Ke-Qiang Hou、Feng Zhou、Albert S. C. Chan、Xiao-Feng Xiong
DOI:10.1021/acs.joc.0c02499
日期:2021.1.15
We report the direct asymmetric synthesis of pyrimido[2,1-b]benzothiazoles using a commercially available chiral amine catalyst. A variety of 2-benzothiazolimines and aldehydes were well tolerated under the reaction conditions and generated the corresponding products in 81–99% yields with excellent diastereoselectivities and enantioselectivities (up to >20:1 dr, 99% ee). Furthermore, the products could
我们报告了使用市售手性胺催化剂的嘧啶并[2,1- b ]苯并噻唑的直接不对称合成。在反应条件下,各种2-苯并噻唑啉和醛均具有良好的耐受性,并以81-99%的收率生成了相应的产物,具有非对映选择性和对映选择性(最高> 20:1 dr,99%ee)。此外,产品可以轻松转换为其他有用的手性构件。