N,N-Diethylethanamine trihydrofluoride → methyl (1S,4R)-4-hydroxy-4-{5-[3-(hydroxymethyl)-5-nitrophenyl]-1,3-thiazol-2-yl}-2,2-dimethylcyclohexanecarboxylate

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Reaction Steps

To a solution of the product of Step 3 (4.4 g, 8.23 mmol) in acetonitrile (20 mL) was added triethylamine trihydrofluoride (4 mL, 24.7 mmol). The mixture was stirred for 5 h at room temperature, then quenched with saturated aqueous sodium bicarbonate. The mixture was extracted with ethyl acetate (2×), and the combined organics were dried over sodium sulfate, filtered, and concentrated to give methyl(1S,4R)-4-hydroxy-4-{5-[3-(hydroxymethyl)-5-nitrophenyl]-1,3-thiazol-2-yl}-2,2-dimethylcyclohexanecarboxylate (3.5 g, 7.9 mmol, 96% yield) as an orange-maroon oily foam. MS ESI: [M+H]+ m/z 421.1.

Provenance & Evidence