NHC Brønsted base-catalyzed transformations of isochromene derivatives: regulation of products by the structures of carbene catalysts
作者:Xing-Wen Fan、Ying Cheng
DOI:10.1039/c2ob26622a
日期:——
Two different transformations of α-(isochromen-1-yl)ketones catalyzed by NHC Brønsted bases are reported. In the presence of a triazole carbene, α-(isochromen-1-yl)ketones isomerized into β-(2-(aroylmethylene)phenyl)-α,β-unsaturated ketones in 38–88% yields, while the same reaction catalyzed by an imidazole carbene produced 1-aroylnaphthalene derivatives in 90–99% yields. This work not only provides
据报道,NHC布伦斯台德碱催化了两种不同的α-(异色-1-基-基)酮转化。在存在三唑卡宾的情况下,α-(异戊烯-1-基)酮以38-88%的产率异构化为β-(2-(芳酰基亚甲基)苯基)-α,β-不饱和酮,而相同的反应由咪唑卡宾以90-99%的产率生产1-芳基萘衍生物。这项工作不仅为合成新型的α,β-不饱和酮和多取代的萘衍生物提供了一种新方法,而且还促进了NHC催化剂在布朗斯台德碱催化领域的应用。