<i>N</i>-Iodosuccinimide: An Efficient Reagent for Regioselective Heterocyclization of 3-Allyl-4-hydroxy[1]benzopyran-2-ones
作者:K. C. Majumdar、P. K. Basu、B. Roy
DOI:10.1081/scc-120024750
日期:2003.10
Abstract Thermal Claisen rearrangement of 4-allyloxy[1]benzopyran-2-ones in refluxing chlorobenzene gave 3-allyl-4-hydroxy[1]benzopyran-2-ones in 82–90% yield. A number of 3-iodopyrano[3,2-c][1]benzopyran-5(2H)-ones were synthesized in 80–92% yield by the regioselective heterocyclization of 3-allyl-4-hydroxy[1]benzopyran-2-ones with N-iodosuccinimide in acetonitrile at 0–5°C.