19.
    发明专利
    未知

    公开(公告)号:DE1286032B

    公开(公告)日:1969-01-02

    申请号:DEG0038144

    申请日:1963-07-10

    Applicant: GLAXO LAB LTD

    Abstract: The invention comprises compounds of formula wherein X is a chlorine or bromine atom and R is a hydrogen atom or an acyl group, and the process for preparing 9(11)-dehydro-12-desoxyspirotanes by reducing a 9(11)-dehydro-12-ketospirostane to the corresponding 12-(a - or b -hydroxy)-spirostane or a mixture of the epimers and, if desired, converting this to the 12-acylate, converting this product to the corresponding 12-halospirostane of the invention, and reducing this product to the 9(11)-dehydro-12-desoxyspirostane Starting materials specified are 9(11)-dehydrohecogenin, the 3-acyl derivative thereof, and 9(11)-dehydrobotogenin.

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