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    • 45. 发明申请
    • METHOD FOR MAKING A PROLINEBORONATE ESTER
    • 制备丙硼酸酯的方法
    • WO1993010127A1
    • 1993-05-27
    • PCT/US1992009845
    • 1992-11-19
    • BOEHRINGER INGELHEIM PHARMACEUTICALS, INC.
    • BOEHRINGER INGELHEIM PHARMACEUTICALS, INC.SNOW, RogerKELLY, Terence, A.ADAMS, JulianCOUTTS, SimonPERRY, Clark
    • C07F05/02
    • C07F5/025Y02P20/55
    • A method for the preparation of esters of prolineboronic acid is described. An N-protected pyrrole (I) is lithiated at the 2-position. The lithiated species (II) is reacted with trialkylborate, to yield a protected pyrrole-2-boronic acid (III). This is reduced to form a protected prolineboronic acid (IV), which, in turn, is reacted with a diol to yield an ester (VI). With the boronic acid moiety protected by the ester group, the protecting group on the nitrogen is removed, yielding the desired prolineboronic acid ester (VII). In an alternative synthesis, a protected pyrrolidine (VIII) is lithiated at the 2-position to yield a protected 2-lithio-pyrrolidine (IX). This is reacted with trialkylborate to yield the intermediate IV. The prolineboronic acid esters so produced have a chiral center to the boron atom. Also disclosed are methods for resolving enantiomers. The final products can be coupled to activated carboxylic acids, to yield peptides having a prolineboronic acid ester, instead of an amino acid, at the C-terminus. These boronic acid peptide analogs are useful for inhibiting biologically important proteases. Several methods for removing pinanediol from pinanediol boronate esters are also disclosed.
    • 描述了制备脯氨酸硼酸酯的方法。 N-保护的吡咯(I)在2-位锂化。 锂化物(II)与硼酸三烷基酯反应,得到受保护的吡咯-2-硼酸(III)。 这被还原形成受保护的脯氨酸硼酸(Ⅳ),其又与二醇反应得到酯(Ⅵ)。 用酯基保护的硼酸部分除去氮上的保护基,得到所需的脯氨酸硼酸酯(Ⅶ)。 在替代合成中,保护的吡咯烷(Ⅷ)在2-位锂化,得到保护的2-锂 - 吡咯烷(Ⅸ)。 使其与硼酸三烷基酯反应,得到中间体IV。 如此制备的脯氨酸硼酸酯具有对硼原子的手性中心。 还公开了解决对映异构体的方法。 最终产物可以与活化的羧酸偶联,以产生在C-末端具有脯氨酸硼酸酯而不是氨基酸的肽。 这些硼酸肽类似物可用于抑制生物学上重要的蛋白酶。 还公开了从蒎二醇硼酸酯除去蒎二醇的几种方法。