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5-(5-fluorobenzothiazol-2-oxy)benzo[c][1,2]oxaborol-1(3H)-ol[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
28%
With caesium carbonate; In 1-methyl-pyrrolidin-2-one; at 20℃;
Step 3: Dissolve 50 mg of 0.33 mmol of benzo[c][1,2]oxaborolan-1,5(3H)-diol in 5 mL of N-methylpyrrolidine.Then 75 mg, 0.40 mmol of <strong>[154327-27-2]2-chloro-5-fluorobenzothiazole</strong> and 162.9 mg, 0.5 mmol of cesium carbonate were added.The mixture was stirred at room temperature overnight.Then treating the reaction with ammonium chloride,Extracted with ethyl acetate,The organic phase is washed with saturated brine.Dry, concentrated, and the residual liquid is separated and purified by preparative high-performance liquid phase.Obtaining 5-(5-fluorobenzothiazol-2-oxy)benzo[c][1,2]oxaborol-1(3H)-ol,White solid 28 mg, yield 28percent.