Practical Asymmetric Synthesis of a Potent Cathepsin K Inhibitor. Efficient Palladium Removal Following Suzuki Coupling
作者:Cheng-yi Chen、Philippe Dagneau、Edward J. J. Grabowski、Renata Oballa、Paul O'Shea、Peppi Prasit、Joël Robichaud、Rich Tillyer、Xin Wang
DOI:10.1021/jo0205614
日期:2003.4.1
A large-scale, chromatography-free synthesis of a potent and selective Cathepsin K inhibitor 1 is reported. The key asymmetric center was installed by addition of (R)-pantolactone to the in situ-generated ketene 4a. The final step of the convergentsynthesis of 1 was completed via Suzuki coupling of aryl bromide 7a with unprotected aryl piperazine boronic acid 13. Residual palladium and iron generated