Triphenylphosphine → HCID 135725107, compound

Participants

Reaction Steps

In a flask, 4.75 g (15 mmole) of the compound of Example 1 C, 2.36 g (15.75 mmole) of 3-formyl-4-hydroxybenzaldehyde, and 3.93 g (15 mmole) of triphenylphosphine were dissolved in 45 ml tetrahydrofuran with stirring, under nitrogen. The solution was chilled to −10° and a solution of 2.36 ml (15 mmole) diethyl azodicarboxylate in 15 ml. Tetrahydrofuran was added over 10 minutes, with stirring. The reaction exothermed to +1° C. The bath was removed and the reaction stirred under nitrogen for 18 hours. The reaction was then stripped, dissolved in a minimum amount of methylene chloride and placed in the freezer. The diethoxycarbonylhydrazine was then filtered off and the filtrate was chromatographed, Prep 500, two columns, eluting with 0 to 20% ethyl acetate/toluene gradient over 30 minutes. The appropriate fractions were bulked and stripped to give 3.3 g (49%) product which was used without further purification.

Provenance & Evidence