Sodium Bicarbonate → HCID 68598425, compound

Participants

Reaction Steps

1-[(4-Amino-1-piperidinyl)methyl]-1,2-dihydro-4H,9H-imidazo[1,2,3-ij]-1,8-naphthyridine-4,9-dione (2:1 mixture of R:S, for a preparation see Example 11(d)) (60 mg, 0.2 mmol) and 3-oxo-3,4-dihydro-2H-1,4-benzothiazine-6-carbaldehyde (for a synthesis see WO2002056882, Example 6(c) (38.6 mg, 0.2 mmol) were dissolved in dichloromethane/methanol (2/0.1 ml) at room temperature under argon and stirred at room temperature for 1 h. This was then treated with NaBH(OAc)3 (85 mg, 0.4 mmol) and left to stir for 1 hour. A saturated solution of sodium bicarbonate (20 ml) was then added and the aqueous was extracted with 20% methanol/dichloromethane (3×35 ml). The combined organic extracts were dried on magnesium sulphate, filtered and evaporated. The crude product was purified by silica chromatography using a 0-20% methanol/dichloromethane gradient to provide the free base of the title compound as a yellow solid (37 mg, 39%).

Provenance & Evidence