Racemic N-methyl-S-(nitromethyl)-S-phenylsulfoximine (2) was prepared in 87% yield via alkaline nitration of N,S-dimethyl-S-phenylsulfoximine. Optically active N-methyl-S-(nitromethyl)-S-phenylsulfoximine (both enantiomers) was prepared in similar fashion. Reaction of racemic 2 with p-chlorophenyl isocyanate and a catalytic quantity of triethylamine in the presence of furan afforded dihydrofuroisoxazole
外消旋的N-甲基-S-(硝基甲基)-S-苯基亚磺
酰亚胺(2)是通过N,S-二甲基-S-苯基亚磺
酰亚胺的碱硝化制备的,产率为87%。以类似方式制备旋光的N-甲基-S-(硝基甲基)-S-苯磺
酰亚胺(两种对映体)。在
呋喃存在下,外消旋物2与对
氯苯基
异氰酸酯和催化量的
三乙胺反应,以42%的收率(65:35非对映异构体比例)得到二氢
呋喃异恶唑5(
丁腈氧化物环加成产物)。二氢
呋喃异恶唑5与
苯基锂和
甲基锂的反应分别用苯基和甲基取代了亚磺
酰亚胺基。外消旋物2与芳族
异氰酸酯和
碳酸钾的反应以70-78%的收率得到C-酰化产物,其以叶立德互变异构体9a,b的形式存在。