反应详情

A mixture of 581 mg (2.02 mmoles) of rac.-6-acetyloxy-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-acetonitrile and 418 mg (3.03 mmoles) of K2CO3 in 17 ml of methanol and 3 ml of water was stirred at room temperature for 64 hr. The resulting mixture was poured into water and worked-up with ether in the usual manner giving 480 mg of a tan solid. This material was triturated with cold ether to give 340 mg (69%) of a tan solid. A sample of this material was recrystallized from toluene yielding pure rac. 3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-acetonitrile as a tan solid mp 162-163°.