2-Methyl-3-buten-2-ol → (S)alpha-cyano-3-phenoxy-benzyl(1R,cis)2,2-dimethyl-3-[2-(1,1-dimethylallyloxycarbonyl)-ethynyl]-cyclopropane-carboxylate

Participants

Reaction Steps

Using the procedure of Step A of Example 15, 2 g of (S)α-cyano-3-phenoxy-benzyl (1R,cis) 2,2-dimethyl-3-[2-carboxy-ethynyl]-cyclopropane-carboxylate, 3 ml of 2-methyl-3-buten-2-ol and 150 mg of 4-dimethylamino-pyridine were admixed at 0° C. with 1.06 g of dicyclohexycarbodiimide in 3 ml of methylene chloride and the mixture was stirred at room temperature for 16 hours. The mixture was evaporated to dryness and the residue was chromatographed over silica gel. Elution with a 9-1 cyclohexane-ethyl acetate mixture yielded 700 mg of (S)α-cyano-3-phenoxy-benzyl (1R,cis) 2,2-dimethyl-3-[2-(1,1-dimethylallyloxycarbonyl)-ethynyl]-cyclopropane-carboxylate.

Provenance & Evidence