reaction of 1,2-O-isopropylidene-alpha-D-xylo-5-hexulofuranuronamide (1) with the Wittig reagent ethoxycarbonylmethylenetriphenylphosphorane gave 3-(1,2-O-isopropylidene-beta-L-threofuranos-4-yl)maleimide (2, 15%) and ethyl 5-carbamoyl-5,6-dideoxy-1,2-O-isopropylidene-alpha-D-xylo-hept-5-enof uranuronate (3, 76%), a similar reaction of 3-O-benzyl-1,2-O-isopropylidene-alpha-D-ribo-5-hexulofuranuronamide++
1,2-O-异亚丙基-α-D-xylo-5-hexulofurafurronronamide(1)与Wittig试剂乙氧基羰基亚甲基三苯基
磷烷的反应生成了3-(1,2-O-异亚丙基-β-L-苏
呋喃基-4-基)马来
酰亚胺(2,15%)和5-
氨基甲酰基-5,6-二脱氧-1,2-O-异亚丙基-
铀铀酸酯(3,76%),类似的反应3-O-苄基-1,2-O-异亚丙基-α-
D-核糖-5-己
呋喃呋喃酰胺+ +(4)仅产生3-(3-O-苄基-1,2-O-异亚丙基-α-D (2-
呋喃呋喃并-4-基)丙二
酰亚胺(5),80%)和3-O-苄基-1,2-O-异亚丙基-α-D-二
甲苯基-5-六
氟呋喃核糖酰胺++ +(6)生成的仅乙基3-O-苄基-5-
氨基甲酰基-5,6-二脱氧-1,2-O-异亚丙基-α-D-二
甲苯基庚基-5-异
呋喃呋喃酸酯(7,85%)。马来
酰亚胺环的形成取决于HO-3'的取向和取代。