O-methyl-N,N'-diisopropylisourea → HCID 86739242, compound

Participants

Reaction Steps

A mixture of 4.2 g of (1R,trans) 2,2-dimethyl-3-[(E) (dihydro-2-oxo-3-(2H)-furanylidene)-methyl]-cyclopropane-1-carboxylic acid, 3.5 g of methyl N,N'-diisopropyl-carbamimidate and about 20 ml of ethyl acetate was refluxed for 2 hours and was cooled and evaporated to dryness. The residue was chromatographed over silica gel and was eluted with a 6-4 cyclohexane-ethyl acetate mixture to obtain 2.5 g of methyl (1R,trans) 2,2-dimethyl-3-[(E) (dihydro-2-oxo-3-(2H)-furanylidene)-methyl]-cyclopropane-1-carboxylate with a specific rotation of [α]D20 =+65°±2.5° (c=0.6% in ethanol).

Provenance & Evidence