Triethylamine → (2S)-3-(4-{[3-(2,3-dichlorophenyl)isoxazol-5-yl]methyl}piperazinyl)-1-(2-methylbenzothiazol-5-yloxy)propan-2-ol

Participants

Reaction Steps

To a solution of 2,3 dichlorobenzaldehyde oxime (136 mg, 0.725 mmol) in 1 ml of dichloromethane was added aqueous sodium hypochlorite solution (>4%, 1.35 ml, 0.725 mmol). The reaction was sealed in a reaction vessel with a stirbar. The vessel was subjected to microwave under the following conditions: temperature=60° C., time=240(s), high absorbance, fixed hold time=on, pre-stir=10(s). After 4 minutes (2S)-1-(2-methylbenzothiazol-5-yloxy)-3-(4-prop-2-ynylpiperazinyl)propan-2-ol (50 mg, 0.145 mmol) in 1 ml of dichloromethane was added, followed by triethylamine (0.022 ml, 0.145 mmol). The reaction vessel was again subjected to microwave under the following conditions: temperature=110° C., time=240(s), high absorbance, fixed hold time=on, pre-stir=10(s). After 4 minutes, thin layer chromatography (10:1 dichloromethane:methanol) showed consumption of starting material and product formation. The solution was evaporated under reduced pressure and purified by preparative thin layer chromatography (10:1 dichloromethane:methanol) followed by HPLC to yield (2S)-3-(4-{[3-(2,3-dichlorophenyl)isoxazol-5-yl]methyl}piperazinyl)-1-(2-methylbenzothiazol-5-yloxy)propan-2-ol (20) (3.2 mg, M+1=533.21)

Provenance & Evidence