Photoinduced Cyclization of 3-Acyl-2-halo-1-[(ω-phenylethynyl)alkyl]indoles to Azaheterocyclo[1,2,3-<i>lm</i>]-Fused Benzo[<i>c</i>]carbazoles
作者:Shenci Lu、Ren Wang、Yi Yang、Yang Li、Zongjun Shi、Wei Zhang、Zhifeng Tu
DOI:10.1021/jo200630x
日期:2011.7.15
3-lm]carbazole (3a–h), are produced in the photocyclization of 2-halo-1-[(ω-phenylethynyl)alkyl]indole-3-carbaldehydes (1a–h). In contrast, only products 2a–h are produced in the photocyclization of 3-acetyl-2-chloro-1-[(ω-phenylethynyl)alkyl]indole-3-carbaldehydes (1o–t). The 9-H in 3a–h (n = 2) does originate from the formyl group in 1a–h via 1,5-hydrogen shift. The structures of three new products, 9-bromo-7
通过3-酰基-2-卤代-1-[[ω-苯基乙炔基)的光环化反应,开发了一锅合成氮杂杂环[1,2,3- lm ]稠合的苯并[ c ]咔唑(2和3)的方法。烷基]吲哚类(1),收率良好至优异。所有产品都是由1通过两次连续的光环化反应形成的。两种产物,9-氯-7,8-二氢-6 H-苯并[ c ]吡啶基[1,2,3- lm ]咔唑(2a – h)和7,8-二氢-6 H-苯并[ c ]吡啶并[1,2,3- lm ]咔唑(3a – h),是在2-卤-1-[[(ω-苯基乙炔基)烷基]吲哚-3-甲醛(1a – h)的光环化过程中产生的。相反,在3-乙酰基-2-氯-1-[[(ω-苯基乙炔基)烷基]吲哚-3-甲醛(1o – t)的光环化反应中,仅产生产物2a – h。3a – h(n = 2)中的9-H确实通过1,5-氢转移而起源于1a – h中的甲酰基。三种新产品的结构9-bromo-7,8-dihydro-6