Boron trifluoride etherate → HCID 53832065, compound

Participants

Reaction Steps

Triethyl phosphite (0.98 ml, 5.7 mmol) was added dropwise to a solution of dimethyl acetal 27 (1.08 g, 4.7 mmol), boron trifluoride etherate (1.2 ml, 9.8 mmol) and CH2Cl2 (10 ml) at 0° C. After warming the reaction to room temperature overnight, the solution was partitioned with 3N HCl and the aqueous layer was washed with CH2Cl2 twice. The organic layers were washed with dilute NaHCO3, dried over Na2SO4, decanted and evaporated. The crude residue was purified on a silica gel column, eluting with 0-80% EtOAc/hexanes, to give 1.36 g (86%) phosphonate 28 as a slightly yellow oil.

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