Synthesis of pyrrolo[2,1-<i>a</i>]phthalazines by 1,3-dipolar cycloaddition of phthalazinium<i>N</i>-ylides with alkenes in the presence of tetrakis-pyridine cobalt (II) dichromate
作者:Jian Zhou、Yuefei Hu、Hongwen Hu
DOI:10.1002/jhet.5570370524
日期:2000.9
10b-tetrahydropyrrolo[2,1-a]phthalazine (8), prepared by 1,3-dipolar cycloaddition of 2-phenacyl phthalazinium bromide (6a) with acrylonitrile (7a), can be aromatized by tetrakis-pyridine cobalt (II) dichromate (TPCD) to give 1-cyano-3-benzoylpyrrolo[2,1-α]phthalazine (9a) in good yield. Furthermore, a general and convenient one-pot procedure for preparation of pyrrolo[2,1-α]phthalazines (9a-p) was developed
我们在此首次描述了通过2-的1,3-偶极环加成反应制得的1-氰基-3-苯甲酰基-1,2,3,10b-四氢吡咯并[2,1- a ]酞嗪(8)。苯甲酰酞菁溴化物(6a)与丙烯腈(7a)可以用重铬酸四(2-吡啶)吡啶钴(II)(TPCD)进行芳构化,以高收率得到1-氰基-3-苯甲酰基吡咯并[2,1-α]酞嗪(9a) 。此外,一般的和方便的一锅法用于制备吡咯并[2,1-α]酞嗪(9A-P )通过phthala zinium的1,3-偶极环加成开发Ñ -ylides(6A-C )与烯烃(7a-g)在TPCD存在下。