The acid-catalysed condensation of d-xylose with benzaldehyde in the presence of alcohols. Two diastereoisomeric 1,2:3,5-di-O-benzylidene-α-d-xylofuranoses
作者:R.J. Ferrier、L.R. Hatton
DOI:10.1016/s0008-6215(00)86035-8
日期:——
Abstract d -Xylose condenses with benzaldehyde-primary alcohol mixtures to give 2,4:3,5-di-O-benzylidene- d -xylose dialkyl acetals from which the dialkyl acetals can be obtained by hydrogenolysis. Ethylene glycol affords the analogous ethylene acetal derivatives. With benzaldehyde-secondary or tertiary alcohol mixtures, two 1,2:3,5-di-O-benzylidene- d -xylofuranoses, which differ only in their stereochemistry
摘要d-木糖与苯甲醛-伯醇混合物缩合,得到2,4:3,5-二-O-亚苄基-d-木糖二烷基乙缩醛,可通过氢解从中得到二烷基乙缩醛。乙二醇提供类似的乙缩醛衍生物。用苯甲醛-仲或叔醇混合物,形成两个1,2:3,5-二-O-亚苄基-d-木呋喃糖酶,它们的立体化学仅在1,2-环上的新缩醛中心不同。分配了亚苄基位置的绝对构型,发现六元3,5-环的构象为“ O-内侧”。