Carbonic acid-guanidine (1:1) → HCID 178508869, compound

Participants

Reaction Conditions

Reaction Steps

In a 500 mL round bottomed flask, a suspension of guanidine carbonate (11.1 g, 61.4 mmol) in N,N-dimethylformamide (100 mL) was heated with stirring to 160° C. for 10 minutes, and a solution of the product from Example 12A (6.46 g, 30.7 mmol) in N,N-dimethylformamide (15 mL) was added dropwise over 2 minutes. The flask that contained the product from Example 12A was rinsed with an additional 10 mL of N,N-dimethylformamide and this was added to the reaction over 2 minutes. The reaction was heated to 165° C. for 20 minutes, cooled to room temperature and partitioned between 1 M sodium hydroxide (650 mL) and ether (200 mL). The layers were separated and the ether layer was extracted with 1 M sodium hydroxide (25 mL). The ether layer was disposed of. The combined aqueous sodium hydroxide layers were cooled in an ice bath and acidified to pH ˜7 with concentrated hydrochloric acid. After standing at ambient temperature for 15 minutes, the resulting solid was collected by filtration, washed with water and dried overnight in a drying oven with heating under vacuum to provide the title compound: 1H NMR (DMSO-d6) δ 0.78-0.96 (m, 1H), 1.00-1.35 (m, 5H), 1.61-1.74 (m, 3H), 1.75-192 (m, 2H), 2.01-2.18 (m, 1H), 2.28-2.58 (m, 2H), 6.13 (br s, 2H), 10.66 (s, 1H); MS (DCl/NH3) m/z 220 (M+H)+.

Provenance & Evidence