作者:Fabio Prati、Giovanni Tosi、Federica Zironi、Emilia Caselli、Arrigo Forni
DOI:10.1055/s-2004-822395
日期:——
A new biocatalytic route for the synthesis of both enantiomers of Timolol (1) is described. Starting from 3,4-dichloro1,2,5-thiadiazole (2), (R)- and (S)-Timolol (87% ee) were obtained in 35% and 30% overall yield, respectively. Asymmetric reduction of the intermediate haloketone 5 with baker's yeast afforded the corresponding halohydrin 6 in the optically active form (87% ee), which gave the R enantiomer
描述了合成噻吗洛尔 (1) 的两种对映异构体的新生物催化途径。从 3,4-二氯 1,2,5-噻二唑 (2) 开始,(R)- 和 (S)-噻吗洛尔 (87% ee) 分别以 35% 和 30% 的总产率获得。用面包酵母不对称还原中间体卤代酮5,得到光学活性形式的相应卤代醇6(87% ee),得到噻吗洛尔的R对映异构体(二异构体)。S 对映异构体 (eutomer) 是通过在 Mitsunobu 程序后反转卤代醇的构型获得的。