Methyl iodide → HCID 68480243、化合物

反応式

[CH2:1]([O:5][C:6]1[CH:7]=[C:8]([CH:12]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:13][NH:14][CH2:15][C:16]([N:18]([CH3:20])[CH3:19])=[O:17])[CH:9]=[CH:10][CH:11]=1)[CH2:2][CH2:3][CH3:4].[CH3:28][Si](C)(C)[N-][Si](C)(C)C.[Li+].CI>C1COCC1>[CH2:1]([O:5][C:6]1[CH:7]=[C:8]([CH:12]([C:21]([O:23][C:24]([CH3:26])([CH3:25])[CH3:27])=[O:22])[CH2:13][NH:14][CH:15]([CH3:28])[C:16]([N:18]([CH3:20])[CH3:19])=[O:17])[CH:9]=[CH:10][CH:11]=1)[CH2:2][CH2:3][CH3:4]

参加物

実験手順

A solution of 2-[2-(3-butoxyphenyl)-(tert-butoxycarbonyl)ethylamino]-N,N-dimethylacetamide (0.410 g, 1.1 mmol; prepared according to Step 3 of Example 1) in dry THF (5 ml) was cooled to −78° C. and LiHMDS (lithium hexamethyldisilazide), 1 M in THF, (1.43 ml, 1.4 mmol) was added dropwise. The mixture was stirred 30 min then a solution of methyl iodide (0.187 g, 1.3 mmol) in dry THF (1 ml) was added dropwise. The mixture was stirred for 2 h allowing the cooling bath to expire. The solvent was evaporated under reduced pressure and the residue was dissolved in EtOAc (15 ml) and washed with water (2×15 ml). The organic phase was dried over Na2SO4, filtered and the solvent was evaporated under reduced pressure. The residue was purified by flash chromatography (silica, petroleum ether:EtOAc from 8:2 to 6:4) affording the title compound (0.22 g, 52% yield) as a colourless oil.