Sodium borohydride → 4-((1R,2R,4R,5S,8S,12R)-2-hydroxy-4-methyl-6-oxo-9,13-dioxa-7-azatetracyclo[6.3.1.11,4.05,12]tridec-7-yl)-2-(trifluoromethyl)benzonitrile

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Reaction Steps

Sodium borohydride (0.56 g, 14.7 mmol) was added in portions to a solution of Example 5 (2.9 g, 7.39 mmol) in THF (10 mL) and MeOH (10 mL) at 0° C. The reaction mixture was stirred for 15 min and quenched with drop-wise addition of aqueous saturated ammonium chloride (20 mL). The organic solvents were removed in vacuo and the residue was extracted with EtOAc. The organic layer was dried over anhydrous magnesium sulfate, filtered, and concentrated. The crude material was purified by silica gel chromatography using an 80 g ISCO column eluting with 0-100% EtOAc in CH2Cl2 at 70 mL/min. Concentration of appropriate fractions provided 2.9 g (99%) of Example 6 as a white solid.

Provenance & Evidence