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    • 1. 发明授权
    • Process for preparing .alpha.-L-aspartyl-L-phenylalanine methyl ester
    • 制备α-L-天冬氨酰-L-苯丙氨酸甲酯的方法
    • US4613460A
    • 1986-09-23
    • US661390
    • 1984-10-16
    • Paolo CasatiBiagio ElefanteClaudio Fuganti
    • Paolo CasatiBiagio ElefanteClaudio Fuganti
    • C07K1/113C07K5/075C07K5/06
    • C07K5/0613
    • A process for preparing .alpha.-L-aspartyl-L-phenylalanine methyl ester: ##STR1## in which: (a) the compound methyl N(.alpha.-L-aspartyl).alpha.-aminocinnamate, protected at the nitrogen, of formula: ##STR2## where R is a protector group at the nitrogen, is subjected to hydrogenation at the olefin bond by means of gaseous hydrogen in the presence of a hydrogenation catalyst, to give the compound of formula: ##STR3## where R has the aforesaid meaning, in the form of a mixture of .alpha.-L-aspartyl-L-phenylalanine methyl ester protected at the nitrogen, and .alpha.-L-aspartyl-D-phenylalanine methyl ester protected at the nitrogen;(b) the protector group is removed from the .alpha.-L-aspartyl-L-phenylalanine and .alpha.-L-aspartyl-D-phenylalanine methyl esters protected at the nitrogen;(c) the .alpha.-L-aspartyl-L-phenylalanine methyl ester is separated and recovered from the deprotection reaction product.
    • 制备α-L-天冬氨酰基-L-苯丙氨酸甲酯的方法:其中:(a)在氮保护下的式(A)化合物甲基N(α-L-天冬氨酰基)α-氨基肉桂酸酯 :其中R是氮的保护基,在氢化催化剂存在下,通过气态氢在烯烃键上进行氢化,得到下式的化合物:(IV) )其中R具有上述含义,以氮保护的α-L-天冬氨酰基-L-苯丙氨酸甲酯和氮保护的α-L-天冬氨酰-D-苯丙氨酸甲酯的混合物形式; (b)保护基团从α-L-天冬氨酰基-L-苯丙氨酸和α-L-天冬氨酰-D-苯丙氨酸甲酯在氮气保护下除去; (c)从脱保护反应产物中分离并回收α-L-天冬氨酰基-L-苯丙氨酸甲酯。
    • 2. 发明授权
    • Process for the preparation of L-carnitine
    • 制备左旋肉碱的方法
    • US4664852A
    • 1987-05-12
    • US866144
    • 1986-05-22
    • Paolo CasatiClaudio Fuganti
    • Paolo CasatiClaudio Fuganti
    • C07C69/675C07C20060101C07C67/00C07C227/00C07C227/08C07C227/18C07C229/22C07C231/00C07C231/04C07C231/12C07C235/12C07C235/80C07C101/12
    • C07C229/22
    • A process for preparing L-carnitine (I) wherein(a) diketene (II) is reacted with chlorine, and the chlorination product thus obtained is submitted to amidation by the methylester of an optically-active aminoacid, having formula: ##STR1## wherein R=CH.sub.2 A.sub.r or A.sub.r wherein Ar is a substituted or not-substituted aromatic group, to yield the compound 4-chloro-3-ketobutyrylamide of the methylester of the optically-active aminoacid: (IV)(b) the compound (IV) is reduced in the presence of a reducing agent to yield a mixture (V) of (3R)-4-chloro-3-hydroxybutyrylamide of the methylester of an optically-active acid (VI), and (3S)-4-chloro-3-hydroxybutyrylamide of the methylester of an optically active aminoacid (VII),(c) the compound (VI) is separated and recovered from the reduction reaction product,(d) the compound (VI) is submitted to methanolysis by hydrogen chloride gas in methanol,(e) the methylester of the optically-active aminoacid (III) is precipitated and recovered from the methanolysis reaction product,(f) from the mother liquors the methylester of (3R)-4-chloro-3-hydroxybutyric acid (VIII) is recovered,(g) the compound (VIII) thus obtained is treated with trimethylamine in ethanol, is hydrolyzed with hydrochloric acid and L-carnitine is separated and recovered.
    • 一种制备左旋肉碱(I)的方法,其中(a)双烯酮(II)与氯反应,由此获得的氯化产物经过具有下式的光学活性氨基酸的甲酯进行酰胺化: III)其中R = CH 2 Ar或Ar,其中Ar是取代或未取代的芳族基团,得到光学活性氨基酸的甲酯的化合物4-氯-3-酮丁酰胺:(IV)(b)化合物( IV)在还原剂存在下还原,得到光学活性酸(VI)的甲酯的(3R)-4-氯-3-羟基丁酰胺的混合物(V),和(3S)-4- 光学活性氨基酸(VII)的甲酯的氯-3-羟基丁酰胺,(c)化合物(VI)从还原反应产物中分离回收,(d)化合物(VI)通过氯化氢进行甲醇分解 在甲醇中的气体,(e)光学活性氨基酸(III)的甲酯沉淀并从甲烷中回收 (f)从母液中回收(3R)-4-氯-3-羟基丁酸(VIII)的甲酯,(g)将所得化合物(Ⅷ)用乙醇中的三甲胺处理, 用盐酸水解并分离和回收L-肉碱。