2-Isopropoxycarbonylmethyl-4,5-dimethyl-2-oxo-1,3,2-dioxaphospholane → 2,2-Dimethyl-3-[3-oxo-3-isopropoxy-1-propenyl]-cyclopropane-carboxylic acid

Participants

Reaction Steps

Using the procedure of Example 6, 0.76 g of the lactone of (1R,cis) 2,2-dimethyl-3-dihydroxymethyl-cyclopropane-carboxylic acid and 1.9 g of 2-isopropoxycarbonylmethyl-4,5-dimethyl-2-oxo-1,3,2-dioxaphospholane were reacted to obtain 1 of (1R,cis,ΔZ) 2,2-dimethyl-3-[3-oxo-3-isopropoxy-1-propenyl]-cyclopropane-carboxylic acid melting at 100° C. and having a specific rotation of [α]D20 =+71°±2° (c=1% in chloroform) and 0.09 g of the corresponding E isomer.

Provenance & Evidence