Transformation of<i>gem</i>-Dicyanoethenes by Samarium: Direct Formation of Indenes or Direct Decyanation with in Situ Disilylation
作者:Yongjun Liu、Fuqiang Zhang、Yan Qi、Yongmin Zhang、Shusheng Zhang
DOI:10.1002/ejoc.200800258
日期:2008.11
Intramolecular cyclization of 1,1-diaryl-2,2-dicyanoethenes promoted by samarium metal in DMF in the presence of TMSCl allowed direct construction of the indene core, whereas 1-alkyl-1-aryl-2,2-dicyanoethenes underwent intermolecular coupling cyclization and decyanation under the same conditions. Simultaneously, disilylation occurred at the amino moiety resulting from the reduction of the cyano group
在 TMSCl 存在下,由钐金属在 DMF 中促进的 1,1-二芳基-2,2-二氰乙烯分子内环化允许直接构建茚核,而 1-烷基-1-芳基-2,2-二氰乙烯进行分子间偶联在相同条件下进行环化和脱氰。同时,由于氰基还原,氨基部分发生二甲硅烷基化。然而,当存在微量水时,仅观察到 C=C 键的简单还原。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)