Sodium hydride → {3-Bromo-8-[(4R,5R)-5-(tert-butyldimethylsilanyloxymethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl methoxy]-6,6-dimethyl-11-oxo-6,11-dihydro-benzo[b]carbazol-5-yl}-acetic acid methyl ester

Participants

Reaction Steps

Under nitrogen atmosphere, 3-bromo-8-[(4R,5R)-5-(tert-butyldimethylsilanyloxymethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl methoxy]-6,6-dimethyl-5,6-dihydro-benzo[b]carbazol-11-one (Compound T22-1, 40.0 mg, 65.2 μmol) was dissolved in DMF (0.20 mL), added at 0° C. with methyl bromoacetate (30.5 μL, 134.5 μmol) and sodium hydride (4.5 mg, 132 μmol), and then stirred at room temperature for 2 hr. The residues obtained from the reaction solution after concentration under reduced pressure were purified by silica gel column chromatography (ethyl acetate/hexane) to obtain the title compound (44.5 mg, 85%).

Provenance & Evidence