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
Synthesis of Imidazo[2,1-<i>b</i>]thiazoles via Copper-Catalyzed A<sup>3</sup>-Coupling in Batch and Continuous Flow
作者:Irina V. Rassokhina、Tatyana A. Tikhonova、Sergey G. Kobylskoy、Igor Yu. Babkin、Valerii Z. Shirinian、Vladimir Gevorgyan、Igor V. Zavarzin、Yulia A. Volkova
DOI:10.1021/acs.joc.7b01762
日期:2017.9.15
A straightforward method for the synthesis of functionalized imidazo[2,1-b]thiazoles starting from benzaldehydes, 2-aminothiazoles, and alkynes under copper(I,II) catalysis was developed. The protocol allows the construction of a variety of aryl-substituted imidazo[2,1-b]benzothiazoles, -[2,1-b]thiazoles, and -[2,1-b][1,3,4]thiadiazoles. The reactions were easy to perform affording most of the desired
开发了一种简单的方法,在铜(I,II)催化下,从苯甲醛,2-氨基噻唑和炔烃开始合成官能化的咪唑并[ 2,1- b ]噻唑。该协议允许构建各种芳基取代的咪唑并[2,1- b ]苯并噻唑,-[2,1- b ]噻唑和-[2,1- b ] [1,3,4]噻二唑。反应易于进行,以33–93%的收率提供了大多数所需的产物。在连续流反应器中工艺的强化将产品的收率提高到定量。
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.
Enantioselective Aza-Henry Reaction of Imines Bearing a Benzothiazole Moiety Catalyzed by a<i>Cinchona</i>-Based Squaramide
作者:Hai-Xiao He、Wen Yang、Da-Ming Du
DOI:10.1002/adsc.201200957
日期:2013.4.15
efficient enantioselective aza‐Henry reaction of nitroalkanes to imines bearing a benzothiazole moiety catalyzed by a Cinchona‐based squaramide has been developed. In the reaction of imines, the corresponding products were obtained in good to excellent yields (up to 99%) with excellent enantioselectivities (up to >99% ee) for most of the aromatic substituted imines. The imines with electron‐withdrawing groups
Asymmetric synthesis of benzothiazolopyrimidines with high catalytic efficiency and stereoselectivity under bifunctional phosphonium salt systems
作者:Dongming Lu、Jia-Hong Wu、Jianke Pan、Xue Chen、Xiaoyu Ren、Tianli Wang
DOI:10.1039/d0cc04820h
日期:——
allenoates mediated by an amino acid-derived bifunctional phosphonium salt catalyst is developed. This protocol provides a new and facile synthetic approach to create a broad range of isothiourea-based benzothiazolopyrimidine derivatives under mild reaction conditions with high isolated yields and excellent diastereo- and enantioselectivities.