申请人:Yong Kelvin H.
公开号:US20100137597A1
公开(公告)日:2010-06-03
This application discloses a novel process for the preparation of phosphonate esters useful as intermediates in the preparation of himbacine analogs, themselves useful as thrombin receptor antagonists. The chemistry taught herein can be exemplified by the following scheme:
wherein R
9
is selected from alkyl, aryl heteroaryl and arylalkyl groups having 1 to 10 carbon atoms, and R
11
is selected independently for each occurrence from alkyl, aryl heteroaryl and arylalkyl groups having 1 to 10 carbon atoms and hydrogen, X
2
is Cl, Br, or I; X
3
is selected from Cl and Br; and PdL
n
is a supported palladium metal catalyst or a soluble heterogeneous palladium catalyst. The L-derivatizing reagent is a moiety which converts the alcohol functional group of compound 137D to any leaving group which can be displaced by a triorgano-phosphite phosphonating agent.