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    • 10. 发明授权
    • Process for preparing D-alloisoleucine and intermediates for preparation
    • 制备D-异亮氨酸和制备中间体的方法
    • US06310242B1
    • 2001-10-30
    • US09251475
    • 1999-02-17
    • Hirofumi NodaKoji OhsakaKenichi SakaiHisamichi Murakami
    • Hirofumi NodaKoji OhsakaKenichi SakaiHisamichi Murakami
    • C07C20500
    • C07C229/08C07C227/34C07C227/36
    • Disclosed are a novel process for preparing D-alloisoleucine and an improved process for epimerizing L-isoleucine to prepare D-alloisoleucine. In the former process, (2S, 3S)-tartaric acid derivative of formula I below; wherein R stands for a hydrogen atom, a C1-C3 lower alkyl group, lower alkoxy group, chlorine atom, bromine atom and nitro group; and “n” is a number of 0, 1 and 2; is combined with an epimer mixture of L-isoleucine and D-alloisoleucine in a reaction medium to form a complex of D-alloisoleucine and the compound of formula I. The precipitated complex is decomposed by putting it in an alcohol to isolate D-alloisoleucine. In the latter process, L-isoleucine is suspended in an inert solvent which does not substantially dissolve amino acids, and epimerized in the presence of C1-C5 saturated lower fatty acid and salicylaldehyde.
    • 公开了制备D-异亮氨酸的新方法和用于差异化L-异亮氨酸以制备D-异亮氨酸的改进方法。 在前一方法中,下式I的(2S,3S) - 酒石酸衍生物; 其中R代表氢原子,C1-C3低级烷基,低级烷氧基,氯原子,溴原子和硝基; “n”是0,1,2的数; 与L-异亮氨酸和D-异亮氨酸的差向异构体混合物在反应介质中组合以形成D-异亮氨酸与式I化合物的络合物。沉淀的络合物通过将其放入酒精中分离D-异亮氨酸来分解。 在后一过程中,将L-异亮氨酸悬浮在基本上不溶解氨基酸的惰性溶剂中,并在C1-C5饱和低级脂肪酸和水杨醛存在下差向异构化。