反应详情

A solution of ethyl 3-(1-{[3-methoxy-4-(3-o-tolyl-ureido)-phenyl]-acetyl}-1,2,3,4-tetrahydro -quinoxalin-6-yl)-propanoate (0.16 g, Reference Example 1) in anhydrous ethanol (3 ml), at 25° C., was treated dropwise with a solution of lithium hydroxide monohydrate (22 mg) in distilled water (1 ml). After stirring for 4 hours at 25° C. a further portion (10 mg) of lithium hydroxide monohydrate was added and stirring was continued for 16 hours at 25° C. The reaction mixture was evaporated under reduced pressure (2.7 kPa) at 40° C. and the residue was treated with distilled water (40 ml). The resulting solution was washed twice with diethyl ether (20 ml), then acidified to pH 3 by addition of hydrochloric acid (1.3 ml, 1N) and then extracted three times with ethyl acetate (25 ml). The combined organic extracts were washed twice with water (5 ml), then dried over magnesium sulphate and then evaporated under reduced pressure (2.7 kPa) at 40° C. to give the title compound (132 mg) as a foamy solid. 1H NMR [400 Hz, (CD3)2SO]: δ2.2 (s, 3H); 2.5 (bq, 2H); 2.7 (broad t, 2H); 3.2 (broad s, 2H); 3.65 (broad s, 2H); 3.8 (s, 5H); 6.1 (broad s, 1H); 6.4 (broad s, 1H); 6.45 (broad s, 1H); 6.7 (very broad s, 1H); 6.9 (t, J=8 Hz, 1H); 7.15 (m, 3H); 7.8 (d, J=8 Hz, 1H); 8 (broad s, 1H); 8.45(s, 1H); 8.6(s, 1H); 12.1 (broad s, 1H. MS (LSIMS: glycerol+thioglycerol): 503 (MH+).

1. additionwas added
2. customThe reaction mixture was evaporated under reduced pressure (2.7 kPa) at 40° C.
3. additionthe residue was treated with distilled water (40 ml)
4. washThe resulting solution was washed twice with diethyl ether (20 ml)
5. additionacidified to pH 3 by addition of hydrochloric acid (1.3 ml, 1N)
6. extractionextracted three times with ethyl acetate (25 ml)
7. washThe combined organic extracts were washed twice with water (5 ml)
8. dry with materialdried over magnesium sulphate
9. customevaporated under reduced pressure (2.7 kPa) at 40° C.