Tetrahydrofuran → HCID 12638305、化合物

反応式

[O:1]=[C:2]1[NH:7][CH2:6][CH2:5][N:4]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH:3]1[CH2:15][C:16]1[CH:21]=[CH:20][C:19]([O:22][CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)=[CH:18][CH:17]=1.C1COCC1.[H-].[Na+].Br[CH2:38][C:39]([O:41][CH3:42])=[O:40]>O>[C:11]([O:10][C:8]([N:4]1[CH2:5][CH2:6][N:7]([CH2:38][C:39]([O:41][CH3:42])=[O:40])[C:2](=[O:1])[CH:3]1[CH2:15][C:16]1[CH:17]=[CH:18][C:19]([O:22][CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)=[CH:20][CH:21]=1)=[O:9])([CH3:13])([CH3:14])[CH3:12]

参加物

実験手順

To a solution of t-boc-(4-benzyloxybenzyl)piperazinone 3a (2.66 g, 6.72×10-3 mole) and dry THF (20 ml) under argon at room temperature is added portionwise NaH (0.30 g, 7.4×10-3 mole, 59% oil dispersion). After stirring 1/2 hour at room temperature a solution of methyl α-bromoacetate (0.62 ml, 7.4×10-3 mole) is added via syringe. After stirring overnight the reaction mixture is poured into water which is subsequently extracted with Et2O (3 times). The combined ethereal extracts are washed with saturated aqueous NaCl before being dried over Na2SO4. Filtration of the drying agent and evaporation of the filtrate affords a viscous oil which after column chromatography (silica gel, 10% EtOAc/CHCl3) gives a clear, colorless oil. After standing in the refrigerator this oil crystallizes. The resulting solid is triturated with hexane and collected by filtration affording 4a as colorless matted needles: 2.3 g (74%), m.p. 84°-87° C.