Process for preparing trans-.beta.-benzoylacrylic acid ester
    2.
    发明授权
    Process for preparing trans-.beta.-benzoylacrylic acid ester 失效
    反式β-苯甲酰丙烯酸酯的制备方法

    公开(公告)号:US4994600A

    公开(公告)日:1991-02-19

    申请号:US869782

    申请日:1986-06-02

    CPC分类号: C07C67/327

    摘要: A process for preparing trans-.beta.-benzoylacrylic acid ester having the general formula (I): ##STR1## wherein R is alkyl group or aralkyl group, which comprises dealcoholizing .beta.-benzoyl-.alpha.-alkoxypropionic acid ester having the general formula (II): ##STR2## wherein R is above, in the presence of an acid catalyst to give trans-.beta.-benzoylacrylic acid ester having the general formula (I).According to the process of the present invention, the by-product (II) produced in the esterification reaction of .beta.-benzoylacrylic acid (III) with the alcohol (V) by the dehydration reaction can be converted into the compound (I) by the dealcoholization reaction in the presence of the acid catalyst and thus trans-.beta.-benzoylacrylic acid ester (I) with a high purity can be produced in an industrially advantageous manner.

    摘要翻译: 制备具有通式(I)的反式-β-苯甲酰基丙烯酸酯的方法:其中R是烷基或芳烷基,其包括使具有通式(I)的β-苯甲酰基-α-烷氧基丙酸酯脱醇 (II):其中R在上面,在酸催化剂存在下,得到具有通式(I)的反式-β-苯甲酰基丙烯酸酯。 根据本发明的方法,通过脱水反应在β-苯甲酰基丙烯酸(III)与醇(V)的酯化反应中产生的副产物(II)可以通过 在酸催化剂存在下脱醇反应,从而可以以工业上有利的方式生产具有高纯度的反式-β-苯甲酰基丙烯酸酯(I)。

    Beta-lactam compound and preparation thereof
    10.
    发明授权
    Beta-lactam compound and preparation thereof 失效
    β-内酰胺化合物及其制备方法

    公开(公告)号:US4791198A

    公开(公告)日:1988-12-13

    申请号:US810

    申请日:1987-01-06

    IPC分类号: C07D205/08 C07F7/18

    CPC分类号: C07D205/08 C07F7/186

    摘要: The present invention relates to .beta.-lactam compound having the formula (I): ##STR1## wherein R.sup.1 is a trialkylsilyl group, dimethyl-1,1,2-trimethylpropylsilyl group, acetyl group, benzyloxycarbonyl group, O-nitrobenzyloxycarbonyl group, p-nitrobenzyloxycarbonyl group or t-butyl group, R.sup.2, R.sup.3 and R.sup.4 are a member selected from the group consisting of a lower alkyl group having 1 to 6 carbon atoms, phenyl group and an aralkyl group and a process for preparing the compound which comprises reacting enolsilylethers having the formula (III): ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as above, with chlorosulfonylisocyanate and then reducing the obtained product. The .beta.-lactam compound of the present invention is a useful intermediate for preparing carbapenem .beta.-lactam compound.

    摘要翻译: 本发明涉及具有式(I)的β-内酰胺化合物:其中R1是三烷基甲硅烷基,二甲基-1,1,2-三甲基丙基甲硅烷基,乙酰基,苄氧基羰基,O-硝基苄氧基羰基 对硝基苄氧羰基或叔丁基,R2,R3和R4是选自具有1至6个碳原子的低级烷基,苯基和芳烷基的成员,以及制备该化合物的方法 包括使具有式(III)的烯醇醚:其中R 1,R 2,R 3和R 4如上所述与式(III)化合物反应,得到产物。 本发明的β-内酰胺化合物是制备碳青霉烯类β-内酰胺化合物的有用中间体。