Thionyl Chloride → (1-methyl-1H-tetrazol-5-yl)thioacetyl chloride

Temperature

50 °C

A solution of (1-methyl-1H-tetrazol-5-yl)-thioacetic acid (10 g) and thionyl chloride (10.2 g) in a mixture of dried benzene (130 ml) and dimethylformamide (1 drop) was warmed for 1.5 hours at 50°C. The solvent was distilled off and dried benzene was added to the residue. Excess thionyl chloride was removed by evaporating benzene to give crystals of (1-methyl-1H-tetrazol-5-yl)-thioacetyl chloride. A solution of the above obtained acid chloride in a mixture of dried benzene (70 ml) and dried chloroform (7 ml) was dropwise added over 30 minutes under stirring and ice cooling to a solution of 3,4-dimethoxyphenethylamine (8.0 g) and triethylamine (5.80 g) in a mixture of dried benzene (120 ml) and dried chloroform (15 ml). The mixture was stirred for 1 hour at the same temperature and further 1 hour at room temperature, after which the solvent was removed. The residue was dissolved in ethyl acetate and the solution was in turn washed with water, 5% hydrochloric acid, water, dilute sodium bicarbonate aqueous solution and water, and dried. The solvent was distilled off and the residual oil was crystallized by treating with ether. The crystals were collected by filtration and washed with ether to give N-(3,4-dimethoxyphenethyl)-(1-methyl-1H-tetrazol-5-yl)thioacetamide (9.7 g). The crystals were recrystallized from a mixture of ethyl acetate and ether to give colorless crystals of the object compound, mp 90° to 92°C.

1. distillationThe solvent was distilled off
2. additiondried benzene was added to the residue
3. customExcess thionyl chloride was removed
4. customby evaporating benzene

ORD record

ord-bc14406e680f43d7a3ba1e992e83a241

Source dataset

uspto-grants-1976_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US03963725