An Expedient Route to 2,3-Substituted and Fused Benzo[<i>a</i>]quinolizine-4-thione Framework via Ring Annulation with <i>β</i>-Oxodithioesters
作者:Amrita Roy、Sukumar Nandi、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1021/ol000354v
日期:2001.1.1
annulated benzo[a]quinolizine-4-thiones 3 has been developed. The methodology involves ring annulation of 3,4-dihydro-6,7-dimethoxy-1-methylisoquinoline 1 with a variety of readily accessible acyclic and cyclic beta-oxodithioesters 2 in the presence of triethylamine in refluxing benzene. These benzo[a]quinolizine-4-thiones can be readily converted to the corresponding benzo[a]quinolizine-4-ones 5 via dethiomethylative
[图:见正文]已经开发了一种高效的高度收敛的途径,可以合成迄今未报道的2,3-取代的和环状的苯并[a]喹啉嗪-4-硫酮3。该方法包括在三乙胺存在下,在回流的苯中,将3,4-二氢-6,7-二甲氧基-1-甲基异喹啉1与各种易于获得的无环和环状β-氧二硫酯2进行环环化。这些苯并[a]喹啉嗪-4-硫酮可通过将3与甲基碘烷基化而获得的相应苯并[a]喹啉鎓盐4的脱硫甲基化水解,而容易地转化为相应的苯并[a]喹啉嗪-4-酮5。