反应详情

2-{2-{[2-(4-tert-Butylthiazol-2-yl)benzofuran-5-yloxy]methyl}phenoxy}pentanamide oxime (240 mg) and triethylamine (61 mg) were dissolved in tetrahydrofuran (3 ml). To this solution was added a solution of ethyl chloroformate (65 mg) dissolved in tetrahydrofuran (1 ml) under ice-cooling. The reaction mixture was stirred for fifteen minutes, filtered, and concentrated. The resulting material was dissolved in xylene (4 ml) and 1.8-diazabicyclo[5.4.0]undec-7-ene (152 mg) was added. The mixture was stirred at 50° C. for three hours. The mixture was cooled, diluted with toluene, and washed successively with 0.5N hydrochloric acid and brine, and dried over magnesium sulfate. The crude material was purified on a silica gel column eluting with a mixed solvent of methylene chloride and methanol (1% vol.) to give partially purified product which was again purified on a silica gel column eluting with a mixed solvent of toluene and ethyl acetate (6:1) to give 3-{1-{2-{[2-(4-tert-butylthiazol-2-yl)benzofuran-5-yloxy]methyl}phenoxy}butyl}-1,2,4-oxadiazoline-5-one (120 mg).

1. temperaturecooling
2. filtrationfiltered
3. concentrationconcentrated
4. dissolutionThe resulting material was dissolved in xylene (4 ml)
5. addition1.8-diazabicyclo[5.4.0]undec-7-ene (152 mg) was added
6. stirringThe mixture was stirred at 50° C. for three hours
7. temperatureThe mixture was cooled
8. additiondiluted with toluene
9. washwashed successively with 0.5N hydrochloric acid and brine
10. dry with materialdried over magnesium sulfate
11. customThe crude material was purified on a silica gel column
12. washeluting with a mixed solvent of methylene chloride and methanol (1% vol.)
13. customto give partially purified product which
14. customwas again purified on a silica gel column
15. washeluting with a mixed solvent of toluene and ethyl acetate (6:1)