Oxalyl chloride → (S)-2-phenylpent-4-enoyl chloride
反応式
[C:1]1([C@H:7]([CH2:11][CH:12]=[CH2:13])[C:8](O)=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C(Cl)(=O)C([Cl:17])=O>CN(C)C=O.ClCCl>[C:1]1([C@H:7]([CH2:11][CH:12]=[CH2:13])[C:8]([Cl:17])=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1参加物
5
実験手順
Combine (S)-2-phenylpent-4-enoic acid (1.53 g, 8.7 mmol), dichloromethane (10 mL), and dimethylformamide (1 drop). Add oxalyl chloride (1 mL, 11.46 mmol). After 2 hours, evaporate in vacuo to give (S)-2-phenylpent-4-enoyl chloride. Combine with toluene (10 mL) and add, with vigorous stirring, to a cooled (ice bath) aqueous solution of methylamine (2 mL, 40%). After 1 hour, partition the reaction mixture between water and dichloromethane. Separate the layers, dry the organic over MgSO4, filter, and evaporate in vacuo to give a residue. Triturate the residue with hexane to give a solid. Collect the solid by filtration and dry to give (S)-2-phenylpent-4-enoic acid, N-methyl amide: mp; 97-99° C. Rf =0.53 (silica gel, 50% ethyl acetate/hexane).