反应详情

(3 S)-3-[(1-Methyl indole-2-carbonyl)phenyl-alaninyl]amino-4-oxobutanoic acid, semicarbazone (116 mg, 0.25 mmol) were dissolved in methanol (3 mL), formaldehyde (1 mL, 37% wt. aq) and acetic acid (1 mL) and the resulting solution was stirred for 9 hours under a nitrogen atmosphere at room temperature. The reaction mixture was concentrated in vacuo diluted with water, and extracted twice with ethyl acetate. The ethyl acetate solution was washed with brine, dried over sodium sulfate and concentrated to give a crude product which was triturated with ether to afford the title product as a brown powder (26 mg, 25%). TLC: (methylene chloride:methanol:acetic acid, 20:1:1, silica gel): Rf0.33; MS(EI) for C23H21N3O5; M+H+=422; M−H+=420.

1. concentrationThe reaction mixture was concentrated in vacuo
2. additiondiluted with water
3. extractionextracted twice with ethyl acetate
4. washThe ethyl acetate solution was washed with brine
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated
7. customto give a crude product which
8. customwas triturated with ether