反应详情

N-(2-Amino-4,6-dichloro-5-pyrimidinyl)formamide (Example 3, 2.07 g, 10.0 mmol) was stirred in refluxing absolute ethanol (40 mL) under nitrogen to achieve partial dissolution. To this stirred mixture was added a solution of freshly prepared (1S,4R)-4-amino-2-cyclopentene-1-methanol (PCT Application 9204015.3, 1.57 g, 12.5 mmol as 90%) in ethanol (15 mL) followed by triethylamine (3.5 mL, 25 mmol, freshly distilled from calcium hydride). After 14 hours of reflux, the resulting dark solution was cooled and 1 N sodium hydroxide (10 mL) was added. The volatiles were evaporated in vacuo. The residual tan solid foam was dissolved in 5% methanol-ethyl acetate, and the solution was washed through a silica gel pad to give the title compound as an off-white solid (2.50 g, 88%), after evaporation of solvents. Recrystallization of the solid from ethyl acetate-methanol (20:1) gave the title compound (VIa) as fine white crystals (2.29 g, 81%), m.p. 177-178° C.; mass spectrum (CI/CH4): 286, 284 (M+1), 190, 188 (B+H); 1H-NMR (DMSO-d6)δ: 8.99 and 8.58 (s and d, J=11.1 Hz, total 1, amide NH), 8.11 and 7.80 (s and d, J=11.1 Hz, total 1, amide CH), 6.77 and 6.61 (two d, J=8.0 Hz) overlapping 6.60 and 6.48 (two br s, total 3, NH and NH2), 5.85 and 5.70 (two m, 1 each, CH=CH), 5.15-5.00 (m, 1, NCH), 4.71 (t, J=5.1, 1, OH), 3.45-3.30 (m overlapping H2O, OCH2), 2.80-2.65 (m, 1, CH), 2.45-2.25 and 1.45-1.30 (both m, 1 each, CH2); [α]20 589+21.2°, [α]20 578+22.2°, [α]20546+25.2°, [α]20436+41.4°, [α]20365+48.3° (c 0.50, methanol).

1. dissolutiondissolution
2. distillationfreshly distilled from calcium hydride)
3. temperatureAfter 14 hours of reflux
4. temperaturethe resulting dark solution was cooled
5. addition1 N sodium hydroxide (10 mL) was added
6. customThe volatiles were evaporated in vacuo
7. dissolutionThe residual tan solid foam was dissolved in 5% methanol-ethyl acetate
8. washthe solution was washed through a silica gel pad