Tris(1,1-dimethylethyl)phosphine → N-(4-((1R,3S,5S)-3-amino-5-methylcyclohexyl)pyridin-3-yl)-6-(2,6-difluoro-3-hydroxyphenyl)-5-fluoropicolinamide

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl (1S,3R,5S)-3-(3-(6-bromo-5-fluoropicolinamido)pyridin-4-yl)-5-methylcyclohexylcarbamate (1.0 equiv.) in a microwave vial was added 2,6-difluoro-3-hydroxyphenylboronic acid (5.0 equiv.), KF (5.5 equiv.) and Pd2(dba)3 (0.2 equiv.) followed by THF and water (10:1, 0.03 M). To this mixture was added P(t-Bu)3 (0.4 equiv.) and the reaction was heated in the microwave at 100° C. for 30 min. The organic phase was then separated, the aqueous layer was washed with ethyl acetate, and the organics were combined and concentrated in vacuo. The crude mixture was purified via prep-HPLC, the product fractions were lyophilized and the resulting BOC group was deprotected as described in Method 9 yielding, after RP HPLC purification and lyophilization, N-(4-((1R,3S,5S)-3-amino-5-methylcyclohexyl)pyridin-3-yl)-6-(2,6-difluoro-3-hydroxyphenyl)-5-fluoropicolinamide as the TFA salt. LCMS (m/z): 457.2 (MH+); LC Rt=2.17 min.

Provenance & Evidence