Phenol → 2-(2-Allyloxy4-nitrophenoxymethyl)-oxirane
反応式
[H-].[Na+].[CH2:3]([O:6][C:7]1[CH:12]=[C:11]([N+:13]([O-:15])=[O:14])[CH:10]=[CH:9][C:8]=1[OH:16])[CH:4]=[CH2:5].[C:17]1([OH:23])C=CC=[CH:19][CH:18]=1.S(C1C=CC(C)=CC=1)(OC[C@@H]1OC1)(=O)=O>>[CH2:3]([O:6][C:7]1[CH:12]=[C:11]([N+:13]([O-:15])=[O:14])[CH:10]=[CH:9][C:8]=1[O:16][CH2:19][CH:18]1[CH2:17][O:23]1)[CH:4]=[CH2:5]参加物
5
実験手順
20 g (0.50 mole) of 60% NaH/mineral oil was placed in a two-liter flask and washed with 500 mL of hexane. 1 L of DMF was added, followed by 77 g (0.40 mole) of the 2-allyloxy-4-nitrophenol prepared in the previous step. Addition of the phenol was performed in portions under argon. After stirring the mixture for 30 minutes at room temperature under argon, 108 g (0.48 moles) of (R)-glycidyl tosylate was added and the mixture heated at 70-75° C. under nitrogen overnight. Upon cooling, the DMF was removed in vacuum and replaced with one liter of methylene chloride. This was washed with 500 mL portions of 2 N HCl, saturated sodium bicarbonate and saturated brine and dried over sodium sulfate. The mixture was filtered, concentrated to an oil in vacuum and column chromatographed on silica gel using 1:1 hexane/methylene chloride as eluent. This gave 43 g of product contaminated with traces of the two starting materials, followed by 21 g of pure product as a pale yellow solid. The impure material was recrystallized from 1.2 L of 10% ethyl acetate/hexane to give 34 g of pure (homogeneous on silica gel tlc with 1:1 hexane/methylene chloride) (R)-2-(2-allyloxy-4-nitrophenoxymethyl)-oxirane (m.p. 64° C.).