Tetrabutylammonium Fluoride → HCID 136016240, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-bromo-2-(1-tert-butoxycarbonyl-1H-thieno[3,2-c]pyrazol-3-yl)-6-(tert-butyl-dimethyl-silanyloxy)-indole-1-carboxylic acid tert-butyl ester [0.32 g, 49 mmol, Intermediate (64)] in tetrahydrofuran at 0° C. was added a 1.0 M TBAF solution in tetrahydrofuran (0.51 mL, 0.51 mmol). The resulting solution was stirred at 0° C. for 30 minutes. The solvent was removed. The residue was chromatographed through silica gel (dichloromethane/ethyl acetate, 95/05 as eluant) to produce 3-bromo-2-(1-tert-butoxycarbonyl-1H-thieno[3,2-c]pyrazol-3-yl)-6-hydroxy-indole-1-carboxylic acid tert-butyl ester [0.22 g, 83%, Intermediate (65)] as an orange foam.

Provenance & Evidence