Diastereoselective Synthesis of (–)-6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline-1-carboxylic Acid via Morpholinone Derivatives
作者:Maria Chrzanowska、Agnieszka Grajewska、Maria D. Rozwadowska
DOI:10.3390/molecules28073200
日期:——
A simple and convenient synthesis of (–)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-1-carboxylic acid is described, applying a combination of two synthetic methods: the Petasis reaction and Pomeranz–Fritsch–Bobbitt cyclization. The diastereomeric morpholinone derivative N-(2,2-diethoxyethyl)-3-(3,4-dimethoxyphenyl)-5-phenyl-1,4-oxazin-2-one formed in the Petasis reaction was further transformed into
(–)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-1-carboxylic acid 的简单方便的合成描述,应用两种合成方法的组合:Petasis 反应和 Pomeranz–Fritsch–Bobbitt环化。Petasis反应中形成的非对映体吗啉酮衍生物N-(2,2-二乙氧基乙基)-3-(3,4-二甲氧基苯基)-5-苯基-1,4-恶嗪-2-one进一步转化为1,2, 3,4-四氢异喹啉-1-羧酸通过 Pomeranz-Fritsch-Bobbitt 环化,这是一种合成四氢异喹啉核的经典方法。我们回顾了 Pomeranz-Fritsch 过程的重要应用实例及其在过去二十年发表的手性四氢异喹啉衍生物合成中的改进。