Propargyl alcohol → tert.-butyl(1R,cis)2,2-dimethyl-3-[Z-2-(propargyloxy-carbonyl)-ethenyl]cyclopropane-carboxylate

Participants

Reaction Conditions

Reaction Steps

Using the procedure of Step A of Example 13, 3.6 g of tert.-butyl(1R,cis)2,2-dimethyl-3-[Z-2-carboxy-ethenyl]cyclopropane-carboxylate and 1 ml of propargyl alcohol were reacted and the mixture was stirred at 20° C. for 16 hours and was filtered. The filtrate was extracted with methylene chloride and the organic phase was washed with 0.1N hydrochloric acid, with water until the wash water was neutral, dried and evaporated to dryness under reduced pressure. The residue was taken up in a 9-1 cyclohexane-ethyl acetate mixture and the mixture was stirred at 20° C. for 90 minutes and was filtered. The filtrate was evaporated to dryness and the residue was chromatographed over silica gel. Elution with a 9-1 cyclohexane-ethyl acetate yielded 2.1 g of tert.-butyl(1R,cis)2,2-dimethyl-3-[Z-2-(propargyloxy-carbonyl)-ethenyl]cyclopropane-carboxylate.

Provenance & Evidence