(3S,4R)-4-(3-cyano-2-methyl-1-isothioureido)-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile 、
二甲胺 在
水 、
乙醇 作用下,
反应 1.5h,
以to give (3S,4R)-4-(2-cyano-3,3-dimethylguanidino)-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile (12.05 g)的产率得到(3S,4R)-4-(2-cyano-3,3-dimethylguanidino)-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile