Tetrahydrofuran → 1-(4-Bromophenyl)but-2-yn-1-one

反応式

[Br:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[O:7])=[CH:4][CH:3]=1.[C:10]([Mg]Br)#[C:11][CH3:12].C1COCC1>>[Br:1][C:2]1[CH:9]=[CH:8][C:5]([C:6](=[O:7])[C:10]#[C:11][CH3:12])=[CH:4][CH:3]=1

参加物

反応物 3

HCID 8028Tetrahydrofuran

HCID 707414-Bromobenzaldehyde

HCID 178419101HCID 178419101、化合物

生成物 1

HCID 666150711-(4-Bromophenyl)but-2-yn-1-one収率 83%

実験手順

To an ice cold solution of 4-bromobenzaldehyde (1.3 g, 7 mmol) 0.5 M solution of propynyl magnesium bromide in THF (15 ml, 7.5 mmol) was added under N2. The mixture was stirred for 10 min, quenched with saturated NH4Cl solution and diluted to 50 ml with EtOAc. The organic layer was washed with H2O, dried over MgSO4 and filtered. The filtrate was evaporated to dryness and the residue was dissolved in 1,4-dioxane (25 ml). To it MnO2 (2 g) was added and the resulting suspension was stirred for 4 h at reflux. The mixture was filtered through Celite pad and the filtrate was evaporated to dryness and dried in vacuo to give the title compound (1.29 g, 83%) as a pale solid. 1H-NMR (CDCl3) 7.97 (d, 2H, J=9 Hz); 7.61 (d, 2H, J=9 Hz); 2.14 (s, 3H).