Hydrochloric Acid → HCID 178419138, compound

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Reaction Steps

Under an argon atmosphere, a solution of cerium chloride (8.66 g, 3.0 equivalents) in THF (80 mL) was stirred at room temperature (25° C.) for 30 min. Sodium borohydride (1.37 g, 3.1 equivalents) was added, and the mixture was stirred at room temperature for 1 hr. Then bis(1,3-benzodioxol-5-yl)phosphine oxide (3.4 g, 0.012 moL) synthesized in Reference Example 11 and lithium aluminum hydride (0.53 g, 1.2 equivalents) were successively added at 5° C. and the mixture was stirred at room temperature for 4 hrs. Toluene (80 mL) was added at 3° C. and then 3M-HCl (30 mL) was added. The mixture was stirred at room temperature for 30 min. The reaction mixture was partitioned, and the aqueous layer was extracted with toluene (20 mL). The combined organic layer was washed with 5% aqueous NaCl solution (20 mL) and the organic layer was dried over anhydrous magnesium sulfate, filtered by gravity, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography (silica gel 25 g, toluene). The residue was recrystallized from heptane to give the title compound (2.33 g, white crystals). yield 69.1%. melting point: 88.8° C.

Provenance & Evidence