Regioselective synthesis of 4-aryloxymethylene-2,3,5-trihydrothiopyrano[3,2-b]indoles by the thio-claisen rearrangement of 3-(4′-aryloxybut-2′-ynylthio)indoles
作者:K. C. Majumdar、S. Alam、S. Muhuri
DOI:10.1002/jhet.5570440624
日期:2007.11
A number of new 4-aryloxymethylene-2,3,5-trihydrothiopyrano[3,2-b]indoles are regioselectively synthesized in 78-84% yield by the thio-Claisen rearrangement of 3-(4′-aryloxybut-2′-ynylthio)indoles. The endocyclic double bonded products are isolated by introducing electron withdrawing acetyl group at the indole nitrogen and also can be converted to the corresponding exocyclic isomers by deacetylation
通过3-(4'-芳氧基丁-2'-的硫代-克莱森重排,以78-84%的产率区域选择性地合成了许多新的4-芳氧基亚甲基-2,3,5-三氢硫代吡喃并[3,2- b ]吲哚。炔硫基)吲哚。内环双键产物是通过在吲哚氮上引入吸电子乙酰基而分离的,也可以通过脱乙酰基反应和随后的加热转化为相应的环外异构体。