A novel tandem reaction of 3-substituted coumarins with two equivalents of dimethylsulfoxonium ylide to 2-substituted cyclopenta[b]benzofuran-3-ol derivatives
摘要:
When the coumarins (4) having an electron-withdrawing group at the 3 position were treated with 2.4 equiv. of dimethylsulfoxonium methylide at room temperature in DMF or DMSO, novel tricyclic 2-substituted cyclopenta[b]benzofuran-3-ols (5) were obtained in moderate to good yields. The intermediates, la-substituted benzo [b] cyclopropa [d]pyran-2(1aH)-ones (3), of this tandem reaction were isolated and derived to the corresponding 2-substituted cyclopenta[b]benzofuran-3-ols (5) by treatment with 1.1 equiv. of dimethylsulfoxonium methylide. (C) 2002 Elsevier Science Ltd. All rights reserved.
Utility of Sulphones in Heterocyclic Synthesis: Synthesis of Some Pyridine, Chromene and Thiophene Derivatives
作者:A. Fadda、Hala Refat、M. Zaki
DOI:10.3390/50500701
日期:——
Phenylsulfonylacetonitrile (1) when reacted with α,β-unsaturated nitriles (2a,b) and/or 2-hydroxynaphthaldehyde yields pyridine derivatives (3a,b) and / or the iminochromene derivative (4) respectively. The behavior of (1) towards some a-halogenated compounds has been investigated.
当苯磺酰乙腈(1)与α,β-不饱和腈(2a,b)和/或 2-羟基萘反应时,可分别生成吡啶衍生物(3a,b)和/或亚氨基苯并吡喃衍生物(4)。我们还研究了 (1) 对一些 a 卤代化合物的作用。