A concise synthesis of tetrahydroisoquinoline-1-carboxylic acids using a Petasis reaction and Pomeranz–Fritsch–Bobbitt cyclization sequence
摘要:
A sequence of two reactions: the Petasis reaction, in which an aminoacetaldehyde acetal was used as the amine component, followed by Pomeranz-Fritsch-Bobbitt cyclization, has been shown to be a convenient and simple method for the synthesis of tetrahydroisoquinoline-1-carboxylic acids. Using this method several acids have been prepared in good to excellent yields and characterized as hydrochloride salts. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis of (+)-6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline-1-carboxylic Acid, a Diastereoselective Approach
作者:Ilona Bułyszko、Maria Chrzanowska、Agnieszka Grajewska、Maria D. Rozwadowska
DOI:10.1002/ejoc.201403218
日期:2015.1
The diastereoselectivesynthesis of (+)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-1-carboxylicacid (90 % ee) was accomplished by employing a combination of two synthetic methods, that is, the Petasis synthesis of amino acids and the Pomeranz–Fritsch–Bobbitt synthesis of tetrahydroisoquinoline derivatives. The stereochemical outcome of the synthesis was controlled by chiral aminoacetaldehyde acetals
Optically pure 1,2,3,4‐tetrahydroisoquinoline carboxylic acids constitute an important class of building blocks for the synthesis of natural products and synthetic pharmaceuticals. However, redox deracemization of racemic 1,2,3,4‐tetrahydroisoquinoline carboxylic acids as an attractive method is still challenging for the lack of suitable oxidoreductases. Herein, a D‐amino acid oxidase from Fusarium
important chiral building blocks in the pharmaceutical and fine chemical industries. However, the existing chemo-enzymatic deracemization method employing D-amino acid oxidase from Fusarium solani M-0718 (FsDAAO) suffers from the requirement for a large excess of a nonselective chemical reducing agent. To explore an alternative method, we envisaged a concurrent biocatalytic oxidation and reduction cascade