Hexanoyl chloride → Methyl 4-(6-hexanamido-2,3-dihydrobenz-1,4-oxazin-4ylmethyl)-3-methoxybenzoate

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Reaction Steps

Hexanoyl chloride (0.084 g.) was added to a stirred solution of methyl 4-(6-amino-2,3-dihydrobenz-1,4-oxazin-4-ylmethyl)-3-methoxybenzoate (L) (0.2 g.) in dichloromethane (20 ml.), under an atmosphere of nitrogen. The mixture was stirred for one hour and then diluted with dichloromethane (40 ml.). This mixture was washed with water, dried (MgSO4) and evaporated. The residual oil was dissolved in 3:7 v/v ethyl acetate:hexane, and the solution obtained was allowed to filter through a short column of silica gel, washing with one column volume of the same solvent mixture. Evaporation of the column eluate gave the title compound (0.212 g., 82%), as a foam: NMR (250 MHz, CDCl3) 0.9(t,3H, CH2CH3), 1.3(m,4H, CH3.CH2.CH2), 1.6(m,2H, CH2.CH2.CON), 2.2(t,2H, CH2.CON), 3.35(t,2H, OCH2.CH2N), 3.9(br s,6H, OCH3 + CO.OCH3), 4.2(t,2H, OCH2.CH2N), 4.5(s,2H, CH2 --Ar), 6.8(m,3H), 6.9(br s,1H, NH), 7.2(m,1H), 7.5(m, 2H).

Provenance & Evidence