Vinylpyrazine → HCID 86651976, compound

Participants

Reaction Conditions

Reaction Steps

A degassed mixture of 3-iodo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-indazole-6-carbaldehyde (70 mg, 0.17 mmol), 2-vinylpyrazine (27 mg, 0.25 mmol), N-ethyl-N-isopropylpropan-2-amine (DIPEA, 45 mg, 0.35 mmol), Pd(OAc)2 (3.9 mg, 0.017 mmol) and P(o-MeC6H4)3 (16 mg, 0.052 mmol) in anh MeCN (2.5 mL) was heated with stirring in a sealed tube under microwave irradiation at 120° C. for 40 min. The crude mixture was later concentrated under reduced pressure and purified by prepTLC (SiO2 2:1 hexanes/EtOAc) to provide the title compound as a colorless solid (28 mg, 43%): 1H NMR (400 MHz, CDCl3) δ ppm 10.18 (s, 1H), 8.73 (s, 1H), 8.60 (br. s., 1H), 8.47 (d, J=2.26 Hz, 1H), 8.14-8.18 (m, 2H), 8.07 (d, J=16.06 Hz, 1H), 7.84 (d, J=8.53 Hz, 1H), 7.61 (d, J=16.31 Hz, 1H), 5.85 (s, 2H), 3.61 (t, J=8.28 Hz, 2H), 0.94 (t, J=8.53 Hz, 2H), −0.05 (s, 9H); MS ESI 381.2 [M+H]+, calcd for [C20H24N4O2Si+H]+ 381.5.

Provenance & Evidence