N-Iodosuccinimide mediated regioselective heterocyclization of 3-cyclohex-2′-enyl-4-hydroxycoumarin
摘要:
A number of 3-cyclohex-2'-enyl-4-hydroxy[1]benzopyran-2-ones are regioselectively cyclized by treatment with N-iodosuccinimide in acetonitrile to afford 9'-iodo-2'-oxabicyclo[3,3,I]nonano[4',3'-c][I]benzopyran-2-ones in excellent yield. (C) 2002 Elsevier Science Ltd. All rights reserved.
N-Iodosuccinimide mediated regioselective heterocyclization of 3-cyclohex-2′-enyl-4-hydroxycoumarin
摘要:
A number of 3-cyclohex-2'-enyl-4-hydroxy[1]benzopyran-2-ones are regioselectively cyclized by treatment with N-iodosuccinimide in acetonitrile to afford 9'-iodo-2'-oxabicyclo[3,3,I]nonano[4',3'-c][I]benzopyran-2-ones in excellent yield. (C) 2002 Elsevier Science Ltd. All rights reserved.
Stannic Chloride–Iodine: An Efficient Reagent for Regioselective Synthesis of Furan–Fused Heterocycles
作者:K. C. Majumdar、A. Biswas、P. P. Mukhopadhyay
DOI:10.1080/00397910701470982
日期:2007.8.1
SnCl4-I-2-mediated cyclization of ortho-cyclohexenyl phenol and ortho-cyclohexenyl enol derivatives of coumarin, uracil, dimedone, and pyrone at room temperature for 1 h give the linear cyclized products in 78-90% yield, which, on treatment with 10% Pd-C at 250 degrees C for 1-2 h, afford corresponding aromatized products in 80-84% yield.