Nucleophilic ring-opening in a carbohydrate nitrocyclopropane: A stereospecific approach to chiral isoalkyl structures
作者:Hans H. Baer、Ursula Williams、Bruno Radatus
DOI:10.1016/0008-6215(88)85098-5
日期:1988.3
Chemical reactions to open the cyclopropane ring in (1R)-1,2-dideoxy-3,4:5,6-di-O-isopropylidene-1,2-C-methylene-1-nitro-D-m annitol (1) were investigated. Catalytic hydrogenation over Pd-C produced the corresponding 1-amino compound, isolated as its N-acetyl derivative, but failed to cleave the ring. However, ring opening succeeded by nucleophilic addition of sodium thiophenoxide to 1, giving 1,2-dideoxy-3
(1R)-1,2-二脱氧-3,4:5,6-二-O-异亚丙基-1,2-C-亚甲基-1-硝基-Dm甘露醇中打开环丙烷环的化学反应为(1)调查。在Pd-C上的催化氢化产生了相应的1-氨基化合物,其N-乙酰基衍生物被分离出来,但是未能裂解该环。然而,开环是通过将苯硫醚钠亲核加成到1而得到的,从而得到1,2-二脱氧-3,4:5,6-二-O-异亚丙基-1-硝基-2-C-(苯硫基)甲基-D-甘露醇。后者进一步与噻吩氧化物反应,得到苯基2-脱氧-3,4:5,6-二-O-异亚丙基-2-C-(苯硫基)甲基-D-甘露糖基氢氧肟酸酯。阮内镍将这两种硫代糖衍生物转化为相同的产物,即1-乙酰氨基-1,2-二脱氧-3,4:5,6-二-O-异亚丙基-2-C-甲基-D-甘露糖醇。