Abstract Catalytic osmylation of ( E )-6- O -benzyl-7,8-dideoxy-1,2:3,4-di- O -isopropylidene-α- d - glycero - d - galacto -non-7-enopyranose ( 15 ) proceeded with good stereo-selectivity to give a mixture of 6- O -benzyl-1,2:3,4-di- O -isopropylidene-β- l - lyxo - d - galacto -nonopyranose ( 16 ) and the α- d - xylo - d - galacto isomer 17 in the ratio ∼8.5:1. After debenzylation of this mixture,
摘要(E)-6-O-
苄基-7,8-二
脱氧-1,2:3,4-二-O-异亚丙基-α-d-
甘油-d-半
乳糖基-非-7-
吡喃糖的催化渗透作用( 15)以良好的立体选择性进行,得到6-O-
苄基-1,2:3,4-二-O-异亚丙基-β-l-lyxo-d-半
乳糖-壬基
吡喃糖(16)的混合物-d-
木糖基-d-半
乳糖异构体17的比率为〜8.5∶1。该混合物
脱苄基后,分离出结晶的1,2:3,4-二-O-异亚丙基-β-1-Lyxo-1-L-半
乳糖-非
吡喃糖(21),并直接将其转化为L-Lyxo-。 1-α-壬诺糖醇(1-lyxo-d-半
乳糖-
壬醇)(23)。(E)-
烯丙基醇15可以通过6-O-
苄基-1,2:3,4-二-O-异亚丙基-α-d-
甘油-d-半
乳糖-
庚二醛-1的维蒂希
烯化来制备。 ,