β,β-Dimethylaspartic acid was obtained by the aluminium-amalgam reduction of the O-methyloxime of diethyl 2-oxo-3,3-dimethyl-1,4-butanedioate and subsequent hydrolysis. The (latter) diester was conveniently prepared by the condensation of ethyl 2-bromo-2-methylpropionate with diethyl oxalate, under the influence of magnesium. β,β-Difluoroaspartic acid, threo β-methylaspartic acid and β,β-dimethylaspartic
β,β-
二甲基天冬氨酸是通过铝-
汞齐还原2-乙基氧代-3,3-二甲基-1,4-
丁二酸二乙酯的O-甲基
肟并随后
水解而获得的。(后)二酯可通过在
镁的影响下将
2-溴-2-甲基丙酸乙酯与
草酸二乙酯缩合而方便地制备。将β,β-二
氟天冬氨酸,苏式β-甲基
天冬氨酸和β,β-
二甲基天冬氨酸(作为外消旋物)与
6-氯嘌呤-9-基
核糖核苷偶联,得到相应的核苷。通过与O 2,O 3偶联,将碱
金属7-氧代-7 H-
吡啶基[2.1 - i ]
嘌呤-9-
羧酸盐和6- [2,3-双(甲氧基羰基)丙基]
嘌呤转化为相应的核苷。,O 5-三苯甲酰基核
呋喃呋喃糖基
氯和保护基的去除。介绍了对白血病P-388的
生物学测试结果。