反应详情

To a solution of 100 mg of amine from Example 63 in 2 mL of methanol was added 0.040 mL of acetic acid, 1 g of 3A sieves and 94 mg 2-methoxy-5-(1-tetrazolyl)benzaldehyde (prepared according to the procedures given in PCT International Application WO 95/08549, published 30 Mar. 1995; p. 33). The reaction was stirred at room temperature for 30 min and then 0.080 g of sodium cyanoborohydride was added. The reaction was stirred further for 20 h and was then poured into water, made basic with 2N NaOH and extracted twice with ether. The organic layers were washed with a portion of brine, combined, dried over sodium sulfate and evaporated. The residue was purified by flash chromatography eluting with 0 to 3% methanol in methylene chloride to obtain 100 mg of title compound. NMR (CDCl3): δ 1.5 (br s, NH/H2O), 1.8-1.9 (m, 1H), 1.9-2.05 (m, 2H), 2.2-2.35 (m, 1H), 2.24 (m, 1H), 3.3-3.45 (m, 1H), 3.45-3.55 (m, 2H), 3.59 (s, 3H), 3.63 (s, 3H), 3.68 (d, 1H), 6.86 (d, 1H), 6.98 (t, 2H), 7.17 (m, 2H), 7.36 (d, 1H), 7.46 (dd, 1H), 8.85 (s, 1H).

1. customprepared
2. stirringThe reaction was stirred further for 20 h
3. extractionextracted twice with ether
4. washThe organic layers were washed with a portion of brine
5. dry with materialdried over sodium sulfate
6. customevaporated
7. customThe residue was purified by flash chromatography
8. washeluting with 0 to 3% methanol in methylene chloride