Synthesis of Adamantylglycine Using a Diastereoselective Grignard-to-Nitrone Addition
作者:Volker Jäger、Alevtina Baskakova、Wolfgang Frey
DOI:10.1055/s-0030-1258235
日期:2010.11
tert-leucine, adamantylglycine has so far received little attention. Here, a new, practical synthesis of adamantylglycine is described. This is based on a highly diastereoselective addition of adamantyl Grignard reagent to 2,3-O-cyclohexylideneglyceraldehyde N-benzylnitrone, mediated by the Lewis acid diethylaluminum chloride. Adamantylglycine is obtained from the nitrone in 6 steps and 28% yield as
与具有大取代基的氨基酸如叔亮氨酸相反,金刚烷基甘氨酸迄今为止很少受到关注。在此,描述了一种新的实用的金刚烷基甘氨酸合成方法。这是基于由路易斯酸二乙基氯化铝介导的将金刚烷基格利雅试剂高度非对映选择性地添加到2,3- O-环己基甘油醛N-苄基硝基。以6个步骤从硝酮获得金刚烷基甘氨酸,其为晶体盐酸盐的产率为28%,其中掺入0.5甲醇。 甘油醛-手性硝酮-格氏添加-亲电子甘氨酸当量-晶体结构