PREPARATION OF BENZ[b]INDENO[1,2-e]PYRAN-11(6H)-ONES AND BENZ[b]INDENOL[1,2-e]THIOPYRAN-11(6H)-ONE FROM DILITHIATED 2-INDANONE AND LITHIATED METHYL SALICYCLATES OR LITHIATED METHYL THIOSALICYLATE

摘要

Dithiliated 2-indanone was prepared with excess lithium diisopropylamide, and the resulting intermediate was condensed with several lithiated methyl sailyclates or lithiated methyl thiosalicylate, which was followed by acid cyclization of benz[b]indenol[1,2-e]pyhran-11 (6H)-ones 3-9 or benz[b]indenol[1,2-e]thiopyran-11 (6H)-one 10, which are rate fused-ring indeno-chromones and a new indeno-thiochromone, respectively.