作者:Pintipa Grongsaard、Paul G. Bulger、Debra J. Wallace、Lushi Tan、Qinghao Chen、Sarah J. Dolman、Jason Nyrop、R. Scott Hoerrner、Mark Weisel、Juan Arredondo、Takahiro Itoh、Chengfu Xie、Xianghui Wen、Dalian Zhao、Daniel J. Muzzio、Ephraim M. Bassan、C. Scott Shultz
DOI:10.1021/op300031r
日期:2012.5.18
The development of a convergent, chromatography-free synthesis of an allosteric Akt kinase inhibitor is described. The route comprised 17 total steps and was used to produce kilogram quantities of the target molecule. A key early transformation, for which both batch and flow protocols were developed, was formylation of a dianion derived by deprotonation and subsequent lithium-halogen exchange from a 2-bromo-3-aminopyridine precursor. Improved reaction yield and practicality were achieved in the continuous processing mode. Further significant process developments included the safe execution of a high temperature and pressure hydrazine displacement, separation of substituted cyclobutane diastereomers by means of chemoselective ester hydrolysis, and a late-stage Suzuki fragment coupling under mild conditions.