Acetic Acid → HCID 136207166, compound

Participants

Reaction Steps

To a stirred solution of 1.99 g (3.6 mmol) of dimethyl N-[4-[3-(2,4-bis(acetamido)-1,6-dihydro-6-oxo-5-pyrimidinyl)propylamino]benzoyl]-L-glutamate in 50 ml of acetonitrile and 5 ml of dimethylformamide was added 2 ml of 37% aqueous formaldehyde followed by 0.50 g (8.0 mmol) of sodium cyanoborohydride and 2 ml of acetic acid. After 18 hours the mixture was filtered to remove the solids and the filtrate was spin evaporated in vacuo. The residue was diluted with 100 ml of ice water, and then extracted with four 25 ml portions of methylene dichloride. The combined extracts were filtered through glass wool and spin evaporated in vacuo to give 2.1 g of the title compound as an oil which was a single spot on TLC. The oil was dissolved in 50 ml of ethanol and 50 ml of 1N sodium hydroxide and stirred at 70° C. for 20 hours. The reaction was cooled and spin evaporated in vacuo to a syrup. The syrup was dissolved in 50 ml of water, cooled on ice, and acidified to pH 3-4 with concentrated hydrochloric acid. The white solids were collected, washed with water, and finally with ether; yield, 1.10 g (67%), mp 190°-200° C. (one spot on TLC). Recrystallization from ethanol gave the analytical sample; yield, 0.54 g (33%, mp (166°-1678° changes to hard foam) 198°-204°; TLC (pyridine:BuOH:H2O/1:1:1); NMR (DMSO-d6) δ 8.16 (d, 1H, ArCONH), 7.71 (d, 2H, Ar), 6.66 (d, 2H, Ar), 5.94 (s, 2H, NH2), 5.76 (s, 2H, NH2) 4.36 (m, 1H, CHCO2H), 3.34 (m, 2H, CH2N(CH3)Ar), 2.93 (s, 3H, NCH3).

Provenance & Evidence