Enzymatic and Chemoenzymatic Three‐Step Cascades for the Synthesis of Stereochemically Complementary Trisubstituted Tetrahydroisoquinolines
作者:Vanessa Erdmann、Benjamin R. Lichman、Jianxiong Zhao、Robert C. Simon、Wolfgang Kroutil、John M. Ward、Helen C. Hailes、Dörte Rother
DOI:10.1002/anie.201705855
日期:2017.10.2
Chemoenzymatic and enzymatic cascade reactions enable the synthesis of complex stereocomplementary 1,3,4-trisubstituted tetrahydroisoquinolines (THIQs) with three chiral centers in a step-efficient and selective manner without intermediate purification. The cascade employs inexpensive substrates (3-hydroxybenzaldehyde and pyruvate), and involves a carboligation step, a subsequent transamination, and
化学酶促反应和酶促级联反应能够高效,选择性地合成具有三个手性中心的复杂立体互补的1,3,4-三取代四氢异喹啉(THIQs),而无需中间纯化。级联反应使用廉价的底物(3-羟基苯甲醛和丙酮酸),并涉及一个碳酰化步骤,随后的氨基转移以及最后与羰基共底物的Pictet-Spengler反应。的carboligase和转氨酶的适当选择使能(1R,2S)-metaraminol的生物催化形成。随后的环化反应,无论是被正月桂氨酸合酶酶促催化还是被磷酸盐化学催化,都会在C1位置的产物中产生相反的立体选择性,从而使THIQ C1取代基的两个方向都可进入。