作者:Steven W. Baldwin、John S. Debenham
DOI:10.1021/ol9911472
日期:2000.1.1
The total syntheses of the amaryllidaceae alkaloids haemanthidine, pretazettine, and tazettine as optically pure enantiomers are reported. Using D-mannose as the starting material, the critical relative stereochemical relationships are established with an intramolecular nitrone-alkene cycloaddition reaction. The synthetic route leads successively to (-)-haemanthidine and then to (+)-pretazettine and
[结构:见正文]据报道,作为光学纯对映体,芳基芳烃科生物碱类樟脑定,普他泽汀和他泽汀的总合成物。以D-甘露糖为原料,通过分子内的硝酮-烯烃环加成反应建立了关键的相对立体化学关系。利用这三种生物碱之间已建立的复杂关系,合成途径依次导致(-)-山梨嘧啶,然后到达(+)-Pretazettine和(+)-tazettine。