Tri-o-tolylphosphine → (1R,2S)-2-(3-((E)-2-(6-methylpyridin-3-yl)vinyl)-1H-indazol-6-yl)spiro [cyclopropane-1,3'-indolin]-2'-one

Participants

Reaction Steps

To a mixture of (1R*,2S*)-2-(3-vinyl-1H-indazol-6-yl)spiro[cyclopropane-1,3′-indolin]-2′-one (60.2 mg, 0.2 mmol) and 3-bromo-2-methylpyridine (34.4 mg, 0.2 mmol) in DMF (1.5 mL) was added iPr2NEt (0.07 mL), followed by Pd(OAc)2 (2.2 mg, 0.01 mmol) and P(o-tol)3 (6.7 mg, 0.022 mmol). The resulting mixture was purged with argon, and then microwaved 2 h at 125° C. Purification by prep-HPLC gave the title compound as a light yellow solid (25 mg, 25%). NMR indicated 6% of the branched isomer. 1H NMR (400 MHz, CD3OD) δ 8.90 (s, 1H), 7.74 (dd, J=8.4 Hz, 1.6 Hz, 1H), 8.02 (d, J=8.4 Hz, 1H), 7.87 (d, J=8.4 Hz, 1H), 7.78 (d, J=16.8 Hz, 1H), 7.55 (d, J=16.8 Hz, 1H), 7.49 (s, 1H), 7.07-7.00 (m, 2H), 6.94 (d, J=8.0 Hz, 1H), 6.55 (t, J=7.6 Hz, 1H), 5.97 (d, J=7.6 Hz, 1H), 3.34 (t, J=8.4 Hz, 1H, partially overlapping with MeOH residue), 2.78 (s, 3H), 2.23 (dd, J=7.6 Hz, J=4.8 Hz, 1H), 2.18 (dd, J=8.8 Hz, J=4.8 Hz, 1H); MS ESI 393.1 [M+H]+, calcd for [C25H20N4O+H]+ 393.2.

Provenance & Evidence