Process for the synthesis of 6-bromo-17,21-dihydroxy
3,11,20-trioxo-1,4-pregnadienes 17,21-diesters
    1.
    发明授权
    Process for the synthesis of 6-bromo-17,21-dihydroxy 3,11,20-trioxo-1,4-pregnadienes 17,21-diesters 失效
    合成6-溴-17,21-二羟基3,11,20-三氧代-1,4-孕es烯17,21-二酯的方法

    公开(公告)号:US4440690A

    公开(公告)日:1984-04-03

    申请号:US453844

    申请日:1982-12-27

    IPC分类号: C07J5/00

    CPC分类号: C07J5/0076 C07J5/0053

    摘要: Disclosed is an improved process for the synthesis of 6-bromo-17,21-dihydroxy-3,11,20-trioxo-1,4,-pregnadienes 17,21-diesters. In particular, this invention relates to the conversion of 17,21-dihydroxy-3,11,20-trioxo-1,4-pregnadienes 17,21-diesters to 6-borom-17,21-dihyroxy-3,11,20-trioxo-1,4-pregnadienes-17-21-diesters via bromination under ionic conditions, e.g. bromine in acetic acid.

    摘要翻译: 公开了一种用于合成6-溴-17,21-二羟基-3,11,20-三氧代-1,4-辛二烯17,21-二酯的改进方法。 特别地,本发明涉及将17,21-二羟基-3,11,20-三氧代-1,4-孕代二烯17,21-二酯转化成6-硼烷-17,21-二羟基-3,11,20 通过在离子条件下的溴化,例如,三氧杂-1,4-孕二烯-17-21-二酯 溴在乙酸中。