2-Chloromethyl 2-(trimethylsilyl)ethyl ether → 3-Chloro-5-(1,3-dioxan-2-yl)-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-indazole

Participants

Reaction Conditions

Reaction Steps

To a solution of 2.7 g (11.3 mmol) 3-chloro-5-(1,3-dioxan-2-yl)-1H-indazole (Example 44A) in anhydrous THF (60 ml) were added 1.31 g (13.6 mmol) sodium tert-butoxide at room temperature. The solution was cooled to 0° C., and 2.26 g (13.6 mmol) 2-(trimethylsilyl)ethoxymethyl chloride were added at this temperature. The resulting mixture was stirred at 0° C. for 1 h and then concentrated under reduced pressure. The residue was dissolved in ethyl acetate and washed with water and with brine. The organic layer was dried with sodium sulfate, filtered and evaporated to dryness. The residue was purified by flash chromatography (silica gel; cyclohexane/ethyl acetate 5:1 v/v) to give 1.73 g (41% of th.) of the title compound.

Provenance & Evidence