反应详情

To a solution of 2-pyrrolidin-1-yl-4-p-tolyl-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidine (0.034 g, 0.12 mmol) in MeOH (2 mL) was added formaldehyde (37% in water; 0.10 mL) and NaBH(OAc)3 (0.030 g, 0.14 mmol). After the reaction was judged complete, the mixture was diluted with 1 N NaOH and extracted with CH2Cl2 (3×). The combined organic layers were dried and concentrated. The resulting residue was purified by FCC (2 M NH3 in MeOH/CH2Cl2) to give 0.033 g (91%) of the title compound. HPLC: Rt=8.2 min. MS (ESI): mass calcd. for C19H24N4, 308.4; m/z found, 309.5 [M+H]+. 1H NMR (CDCl3): 7.44 (d, J=8.1, 2H), 7.24 (d, J=7.9, 2H), 3.61-3.58 (m, 4H), 3.42 (5, 2H), 2.92 (dd, J=6.1, 6.0, 2H), 2.74 (dd, J=6.1, 6.0, 2H), 2.40 (5, 3H), 2.39 (5, 3H), 1.97-1.94 (m, 4H).

1. extractionextracted with CH2Cl2 (3×)
2. customThe combined organic layers were dried
3. concentrationconcentrated
4. customThe resulting residue was purified by FCC (2 M NH3 in MeOH/CH2Cl2)