Synthesis of 1,6-Dideoxynojirimycin, 1,6-Dideoxy-D-allo-nojirimycin, and 1,6-Dideoxy-D-gulo-nojirimycinvia Asymmetric Hetero-Diels-Alder Reactions
作者:Albert Defoin、Herv� Sarazin、Jacques Streith
DOI:10.1002/hlca.19960790223
日期:1996.3.20
Asymmetric Diels-Alder reaction of sorbaldehyde O-methyloxime 1d with chiral chloronitroso derivative 2 of D-mannose, followed by osmylation of the primary cycloadduct, led to diol 6a with excellent enantioselectivity (ee > 99%; Scheme 1). Catalytic hydrogenolysis of 6a gave 1,6-dideoxy-D-allo-nojirimycin (7a). Nucleophilic ring opening of cyclic sulfate 8 allowed a straightforward synthesis of 1,
不对称狄尔斯-阿尔德反应而山梨醛ö甲基肟1D与手性chloronitroso衍生物2 d甘露糖,接着由主环加成的锇酸酯化,导致二醇6A具有优异的对映选择性(ee值> 99%;方案1)。的催化氢解6A得到1,6-二脱氧D-同种异体-nojirimycin(图7a)。环状硫酸盐8的亲核开环允许直接合成1,6-二脱氧野oji霉素(11)和1,6-二脱氧-D-古洛基-野oji霉素(12;方案2)。