1,1'-Carbonyldiimidazole → HCID 88054794, compound

Participants

Reaction Steps

A solution of 2.5 mmol of diethyl 2-amino-6-carboxymethyl-azulene-1,3-dicarboxylate in 50 ml of tetrahydrofuran is treated portionwise at 45° C. with 2.5 mmol of N,N-carbonyldiimidazole. The mixture is stirred for 30 minutes, a solution of 2.5 mmol of diethoxyphosphorylmethoxylamine (L. Maier, Phosphorus, Sulphur, and Silicon 1993, Vol. 76, 119-122) in 20 ml of tetrahydrofuran is added and the resulting mixture is heated to reflux for 3 hours. The mixture is concentrated and the residue is chromatographed on silica gel. Elution with isohexane:ethyl acetate 1:1 gives 78% of the title compound of m.p. 146-147° C.

Provenance & Evidence