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。
Enantioselective Synthesis of β-Amino Esters Bearing a Benzothiazole Moiety via a Mannich-Type Reaction Catalyzed by a Cinchona Alkaloid Derivative
作者:Liang Li、Bao-An Song、Pinaki S. Bhadury、Yu-Ping Zhang、De-Yu Hu、Song Yang
DOI:10.1002/ejoc.201100351
日期:2011.7.18
Novel β-amino esters bearing a bioactive benzothiazole moiety were obtained with high enantioselectivities (up to 95 % ee) through a Mannich-type reaction of different imines with malonate in the presence of a new chiral cinchona alkaloid thiourea catalyst. Imines derived from both aromatic and heterocyclic aldehydes were found useful in this conversion.