Photoinduced Molecular Transformations. Part 142. One-step syntheses of 1H-benz[f]indole-4,9-diones and 1H-indole-4,7-diones by a new regioselective photoaddition of 2-amino-1,4-naphthoquinones and 2-amino-1,4-benzoquinones with alkenes
作者:Kazuhiro Kobayashi、Hiroyasu Takeuchi、Shinzo Seko、Yoshikazu Kanno、Sachiko Kujime、Hiroshi Suginome
DOI:10.1002/hlca.19930760818
日期:1993.12.15
Table). The [3 + 2] photoadducts derived from 1 with vinyl ethers and vinyl acetate gave 1H-benz[f]indole-4,9-diones 4e, f, i, in 33–72% yield, by spontaneous loss of the corresponding alcohol or AcOH from the resulting adducts; 4i has a kinamycin skeleton. The [3 + 2] photoaddition also took place on irradiation of the differently substituted amino-1,4-benzoquinones 6, 7, and 12 and excess alkenes 2
2,3-二氢-1 H-苯并[ f ]吲哚-4,9-二酮3a-d,h通过一步反应以前所未有的[3 + 2]区域选择性光加成反应以13-82%的产率形成2-氨基-1,4-萘醌(1)与各种富电子烯烃2(方案1,表)。由1与乙烯基醚和乙酸乙烯酯衍生的[3 + 2]光加合物,通过自发损失相应的1- H-苯并[ f ]吲哚-4,9-二酮4e,f,i,产率为33-72%。生成的加合物中的醇或AcOH; 4i有一个kinamycin骨架。的[3 + 2]光加成也发生在照射所述不同取代氨基-1,4-苯醌6,7,和12和过量烯烃2在苯,给出1个H ^ -吲哚-4,7-二酮衍生物13和分别为14(方案3),15a和16(方案4)和18(方案4)。在这些光加成反应中,最初的产物被证明是氢醌,在空气中氧化生成杂环醌。2,3-二氢-2-甲氧基-2-甲基-5-苯基-1 H处理由2-氨基-5-苯基-1,4-苯醌(7)和2