反应详情

A slurry of 500 mg (1.52 mmoles) of the mixture of E-and Z-3-methyl-5-(2,4,5-trimethyl-3,6-diacetyloxyphenyl)-3-pentenenitrile and 3-methylene-5-(2,4,5-trimethyl-3,6-diacetyloxy-phenyl)pentanenitrile in 5 ml of methanol was treated with 0.71 ml (3.34 mmoles) of a 4.7 M methanolic sodium methoxide solution. The resulting mixture was stirred at room temperature for 4.5 hr, then poured into 20 ml of water and worked-up with ether in the usual manner affording 345 mg (93%) of rac. 3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-acetonitrile as a tan solid.