Hydrochloric Acid → 9H-fluoren-9-ylmethyl-9-(phenylmethyl)-1-oxa-4,9-diazaspiro[5,5]undecane-4-carboxylate

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Reaction Steps

To a solution of compound 402 (2.81 g, 11.4 mmol) in 1,4-dioxane (53 mL) was added 10% sodium bicarbonate in water (21.5 mL) followed by 9-fluorenylmethyl chloroformate (2.96 g, 11.4 mmol). The resulting mixture was stirred at room temperature for four hours, and then neutralized with 3N HCl. The solution was concentrated to a solid and then purified by flash chromatography (0-10% methanol in DCM with 1% NH4OH) to give compound 403 as a white solid (1.2 g, 22.5%). LCMS-ESI (POS), M/Z, M+1: Found 469.1, Calculated 469.2.

Provenance & Evidence