Synthesis of 6H-dibenzo[b,d]pyran-6-ones via dienone-phenol rearrangements of spiro[2,5-cyclohexadiene-1,1′(3′H)-isobenzofuran]-3′-ones
作者:David J. Hart、Adrienne Kim、Ramanarayanan Krishnamurthy、Gregory H. Merriman、Anne-Marie Waltos
DOI:10.1016/s0040-4020(01)80487-7
日期:1992.1
A series of spiro[2,5-cyclohexadiene-1,1′(3′H)-isobenzofuran]-3′-ones were prepared from metalled benzamides and 4,4-dimethoxycyclohexadienone. Rearrangement of these spirodienones under a variety of conditions gave substituted 6H-dibenzo[b,d]pyran-6-ones. Rearrangements in aqueous sulfuric acid gave products of formal O-migration while rearrangements in trifluoroacetic anhydride-trifluoroacetic acid-sulfuric
一系列螺[2,5-环己二烯-1,1'(3' ħ)异苯并呋喃] -3'-酮从铺上苯甲酰胺和4,4-二dimethoxycyclohexadienone制备。这些螺二烯在各种条件下的重排得到取代的6 H-二苯并[ b,d ]吡喃-6-。硫酸水溶液中的重排产生正式的O-迁移产物,而三氟乙酸酐-三氟乙酸-硫酸中的重排通常产生C-迁移产物。