Reaction of 5-aryloxazolidines with arylmagnesium bromides as a new route to N-benzyl-β-hydroxyphenethylamines as starting materials for the preparation of 4-aryl-1,2,3,4-tetrahydroisoquinolines
作者:Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tetlet.2013.03.076
日期:2013.5
Benzaldehydes react smoothly with the non-stabilized azomethine ylide derived from sarcosine and formaldehyde to form 5-aryloxazolidines as intermediates, which undergo ring-opening to give N-benzyl-β-hydroxyphenethylamines in good yields by the action of arylmagnesium bromides. Their subsequent acid-catalyzed cyclization into 4-aryl-1,2,3,4-tetrahydroisoquinolines was performed in moderate to good
苯甲醛与肌氨酸和甲醛衍生的不稳定的偶氮甲meth叶立德反应平稳,形成5-芳基恶唑烷作为中间体,通过芳基溴化镁的作用,开环生成N-苄基-β-羟基苯乙胺,收率高。他们随后的酸催化环化成4-芳基-1,2,3,4-四氢异喹啉的产率中等至良好。