configuration. The conformations of these compounds were established using n.m.r. spectroscopy and X-ray diffraction for 3 and 19 . The major interest of these deoxyhydroxyamino sugars was their easy oxidation into spin-labelled sugar analogs whose conformation could be studied by e.s.r. spectroscopy.
摘要N-取代的
羟胺与2,3-二脱氧-α-d-
甘油-hex-2-enopyranosid-4-ulose(1)发生区域和立体特异性反应,生成N-取代的2,3-二脱氧乙基-2-羟基
氨基-α-d-苏-己基
吡喃糖苷-4- uloses(2 – 7),而O-甲基
羟胺则生成O-甲基
肟(8-10)的混合物,包括立体定向共轭物加成和
肟化的产物( 10)。
硼氢化钠还原的乙基2,3-二脱氧-2-(N-羟基-N-甲基
氨基)-和2,3-二脱氧-2-(N-羟基-N-异丙基
氨基)α-d-苏式-己基
吡喃半
乳糖苷-4 -uloses进行了立体选择性,主要产物具有α-d-
阿拉伯糖构型。这些化合物的构象是使用nmr光谱法和3和19的X射线衍射确定的。