A new regiospecific method for the synthesis of substituted phenanthridines and benzo[j]phenanthridines via aromatic annelation of 1-N-benzenesulfonyl-3-[bis(methylthio)methylene]-1,2,3,4-tetrahydroquinoline-4-one
作者:Pranab K Patra、J.R Suresh、H Ila、H Junjappa
DOI:10.1016/s0040-4020(98)00609-7
日期:1998.8
A new efficient method for the synthesis of substituted phenanthridines, benzo[j]phenanthridines and naphtho[2,1-j]phenanthridines is described. The method involves reaction of α-oxoketene dithioacetal 2 with allyl (3a), methallyl (3b), benzyl (11a-f) and 1-naphthylmethyl (20) magnesium halides followed by cyclization of the resulting carbinolacetals in the presence of BF3.Et2O in refluxing benzene
描述了一种合成取代的菲啶,苯并[ j ]菲啶和萘[2,1- j ]菲啶的新的有效方法。该方法包括使α-氧杂环丁烯二硫缩醛2与烯丙基(3a),甲基烯丙基(3b),苄基(11a-f)和1-萘甲基(20)卤化镁反应,然后在BF 3存在下环化生成的甲醇缩醛。 Et 2 O在回流的苯中。通过在相转移催化剂的存在下用碱处理,将由此获得的二氢菲啶类芳香化。