Formic Acid → HCID 178487363, compound

Participants

Reaction Conditions

Reaction Steps

To 4-{1-methyl-8-(methyloxy)-9-[(piperidin-4-ylmethyl)oxy]-3H-pyrazolo[3,4-c]isoquinolin-5-yl)phenol hydrogen trifluoroacetate (47 mg, 0.11 mmol) was added 37% aqueous formaldehyde (10 μL) and formic acid (150 μL). The mixture was heated to 110° C. for 1.5 h before cooling to rt. The mixture was diluted with a 1:1 mixture of water:acetonitrile and purified by preparative HPLC. The fractions containing desired product were combined, concentrated, and lyophilized to provide 4-(1-methyl-8-(methyloxy)-9-{[(1-methylpiperidin-4-yl)methyl]oxy}-3H-pyrazolo[3,4-c]isoquinolin-5-yl)phenol trifluoroacetate (14.1 mg, 0.026 mmol, 23% yield). 1H NMR (400 MHz, DMSO-d6): δ9.93 (br m, 2H), 7.87 (d, 1H), 7.48 (d, 2H), 7.44 (d, 1H), 6.96 (m, 2H), 4.00 (s, 3H), 3.45 (m, 2H), 3.00-2.96 (q, 2H), 2.83 (s, 3H), 2.74 (d, 3 h), 2.18 (m, 1H), 2.09 (br d, 2H), 1.61-1.52 (m, 2H); MS (EI) for C25H28N4O3: 433 (MH+).

Provenance & Evidence