反应详情

Cyclopentyl chloroformate was added to a stirred solution of the amino ester (A) (0.15 g.) and N-methylmorpholine (0.27 g.) in dichloromethane (3 ml.) at 0°-5° C., under an atmosphere of nitrogen. The mixture was stirred for 30 minutes at 0°-5° C., the cooling bath removed, and stirring continued for 1 hour. The mixture was then poured into 1M hydrochloric acid (15 ml.), and extracted with ethyl-acetate. The combined extracts were dried (MgSO4) and evaporated. The residual oil was purified by flash chromatography on silica gel (50 ml.), eluting with 3:7 v/v ethyl acetate:hexane, to give the title compound (0.18 g., 89%) as a colorless oil; NMR: 1.66(m, 6H), 1.82(m,2H), 3.83(s,3H, CO.OCH3), 3.92(s,3H, OCH3), 3.97(s,2H, CH2.Ar), 5.04(m,1H, --CHO--), 7.09(m, 3H), 7.22(d,1H), 7.42(dd,1H), 7.48(d,1H), 7.57(br,1H), 9.18(br,1H, CONH), 10.57(s,1H, H1 -indole).

1. customthe cooling bath removed
2. stirringstirring
3. waitcontinued for 1 hour
4. additionThe mixture was then poured into 1M hydrochloric acid (15 ml.)
5. extractionextracted with ethyl-acetate
6. dry with materialThe combined extracts were dried (MgSO4)
7. customevaporated
8. customThe residual oil was purified by flash chromatography on silica gel (50 ml.)
9. washeluting with 3:7 v/v ethyl acetate