trans-diaxial 1,6-diol of 3,4-di-O-allyl-2,5-di-O-benzyl-D-chiro-inositol was not cleaved satisfactorily by periodate, but replacement of the allyl substituents with tert-butyldimethylsilyl groups caused conformational inversion of the inositol ring, and the resulting trans-diequatorial 1,6-diol cleaved efficiently to give a dialdehyde from which 3,6-di-O-benzyl-L-ido-tetrahydroxyazepane (2) can be prepared.
在反式二轴1,6
-二醇的存在下,用
高碘酸根离子选择性裂解2,5-二-O-苄基-D-手性肌醇的反式二
甲苯基3,4
-二醇,得到二醛(二醛糖),由此制得3,6-二-O-苄基-D-
甘露聚糖-四羟基氮杂
环庚烷(1)。3,4-二-O-烯丙基-2,5-二-O-苄基-D-手性肌醇的反式二轴1,6
-二醇不能令人满意地被
高碘酸酯裂解,而是用叔酸取代了烯丙基取代基-丁基二甲基甲
硅烷基基团引起肌醇环的构象转化,并且所得到的反式-透明基1,6
-二醇被有效裂解成二醛,由此可以得到3,6-二-O-苄基-L-
氨基-四羟基氮杂
环庚烷(2)准备好了。