Organocatalytic asymmetric [4+2] cyclization of 2-benzothiazolimines with azlactones: access to chiral benzothiazolopyrimidine derivatives
作者:Qijian Ni、Xuyang Wang、Fangfang Xu、Xiaoyun Chen、Xiaoxiao Song
DOI:10.1039/d0cc00736f
日期:——
An organocatalytic asymmetricdomino Mannich/cyclization reaction between 2-benzothiazolimines with azlactones has been successfully developed. With the bifunctional squaramide catalyst, this formal [4+2] cyclization occurs with good to high yields and excellent stereoselectivities (up to 99% ee, >20 : 1 dr), providing an efficient and mild access to chiral benzothiazolopyrimidines bearing adjacent
Organocatalytic enantioselective aza-Friedel–Crafts reaction between benzothiazolimines and 2-naphthols for the preparation of chiral 2′-aminobenzothiazolomethyl naphthols
作者:Chen-Yi Li、Min Xiang、Jian Zhang、Wen-Sheng Li、Ying Zou、Fang Tian、Li-Xin Wang
DOI:10.1039/d1ob01443a
日期:——
developed, and a series of chiral 2′-aminobenzothiazolomethyl naphthols with potential antiproliferative and anthelminticactivities have been successfully and effectively prepared in good to excellent yields (up to 98%) with excellent enantioselectivities (up to >99% ee) even in a scale-up preparation under mild conditions.
Rational Design of Axially Chiral Styrene‐Based Organocatalysts and Their Application in Catalytic Asymmetric (2+4) Cyclizations
作者:Si‐Jia Liu、Zhi‐Han Chen、Jia‐Yi Chen、Shao‐Fei Ni、Yu‐Chen Zhang、Feng Shi
DOI:10.1002/anie.202112226
日期:2022.2.7
A new class of axiallychiral styrene-based organocatalysts has been rationally designed. They enable the chemo-, diastereo- and enantioselective (2+4) cyclization of 2-benzothiazolimines. This work represents the first design of styrene-based chiral thiourea tertiary amine catalysts and the first catalyticasymmetric (2+4) cyclization of 2-benzothiazolimines, and it gives an in-depth understanding