反应详情

Intermediate 26B (0.08 g, 0.20 mmol) was dissolved in DCM and TFA was added. The resulting mixture was stirred for 2 hours. The mixture was concentrated, diluted with water and acetonitrile and lyophilized to produce the desired product as a TFA salt. The residue was dissolved in methanol and filtered through a SPE SCX tube column, eluting with 2N ammonia in methanol to provide Compound 291 (0.055 g, 90%) as a free base. 1H-NMR (400 MHz, CD3OD) δ: 1.05 (s, 9H), 2.87 (s, 2H), 3.15 (t, 2H), 4.07 (t, 2H), 4.35 (s, 2H), 7.52 (m, 3H), 7.67 9m, 2H); LCMS (+ESI) m/z 298.1 [M+H]+.

1. concentrationThe mixture was concentrated
2. additiondiluted with water and acetonitrile