--lactone derivatives and process of preparing same

Details --lactone derivatives and process of preparing same --lactone derivatives and process of preparing same

C - Chemistry, Metallurgy

07

J

260/3, 260/9

C07J 19/00 (2006.01) C07J 9/00 (2006.01) C07J 11/00 (2006.01) C07J 17/00 (2006.01) C07J 53/00 (2006.01) C07J 71/00 (2006.01) C07J 73/00 (2006.01)

Patent

CA 1311469

Abstract Novel ?-lactone derivatives which are useful as intermediate for a synthesis of brassinolide, epi- brassinolide or bisnorbassinolide and a process of preparing them are disclosed. According to the process of the present invention, the introduction of carbon chains which form poly- hydroxylated steroid side chains of brassinolides or the like into steroid nucleus is carried out in one step with the control of stereochemistry of the contigu- ous four acyclic chiral centers.

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