Triphenylphosphine → 5-Methyl-4-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenoxymethyl]-furan-2-carboxylic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-hydroxymethyl-5-methyl-furan-2-carboxylic acid methyl ester (16) (0.5 g), 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenol (1.9 g) and triphenylphosphine (2.3 g) in dry tetrahydrofuran (20 mL) under a nitrogen atmosphere was cooled to 0° C. Di-isopropylazodicarboxylate (1.8 mL) was added drop-wise and the mixture was stirred at room temperature for 72 hours. After concentrating in vacuo, the residue was partitioned between ethyl acetate and water. The organic phase was washed with brine, dried (MgSO4) and concentrated in vacuo. The residue was extracted with pentane and the pentane phase was decanted and concentrated to give compound 51 as an oil. This was used without further purification.

Provenance & Evidence