Ammonium Chloride → 2,2-Dimethyl-3-hydroxy-3-(3-methyl-pent-1-yne-1-yl)-4-(1,2,4-triazol-1-yl)-butane

HRID 358930

Reaction equation

C([Mg]Br)C.[CH3:5][CH:6]([CH2:9][CH3:10])[C:7]#[CH:8].[CH3:11][C:12]([CH3:22])([C:14](=[O:21])[CH2:15][N:16]1[CH:20]=[N:19][CH:18]=[N:17]1)[CH3:13].[Cl-].[NH4+]>C(OCC)C.ClCCl>[CH3:13][C:12]([CH3:22])([C:14]([OH:21])([C:8]#[C:7][CH:6]([CH3:5])[CH2:9][CH3:10])[CH2:15][N:16]1[CH:20]=[N:19][CH:18]=[N:17]1)[CH3:11]

Participants

Conditions

Temperature: 0 °C

Procedure

10 To a solution of ethyl magnesium bromide (20 ml) of a 3M solution in diethyl ether) in dry diethyl ether (30 ml) under N2 at room temperature was added a solution of 3-methyl-1-pentyne (5 g, 0.06 mol) in diethyl ether (20 ml). The resulting mixture was heated under reflux for 1 hour, and then cooled to 0° C. To this mixture was added slowly a solution of 2,2-dimethyl-4-(1,2,4-triazol-1-yl)-butane-3-one (8.4 g, 0.05 mol) in dry dichloromethane (150 ml), and the mixture stirred for 45 minutes, a gelatinous precipitate formed. Ammonium chloride solution was added to the mixture, and the organic layer separated and washed with water and brine, dried over MgSO4 and concentrated in vacuo. The residue was chromatographed on silica eluting with diethyl ether (20-100%) in petrol gave 2,2-dimethyl-3-hydroxy-3-(3-methyl-pent-1-yne-1-yl)-4-(1,2,4-triazol-1-yl)-butane) as a white solid (4.29 g) (mpt=59°-60° C.).

Workup

temperatureThe resulting mixture was heated
temperatureunder reflux for 1 hour
customa gelatinous precipitate formed
customthe organic layer separated
washwashed with water and brine
dry with materialdried over MgSO4
concentrationconcentrated in vacuo
customThe residue was chromatographed on silica eluting with diethyl ether (20-100%) in petrol

Sources & evidence

ORD record: ord-df759c25482744f88b06d374d8e81863
Source dataset: uspto-grants-1991_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04999043

Linked notes

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