Pyridine → HCID 86739798, compound

Participants

Reaction Steps

0.9 ml of pyridine and 2 g of dicyclohexylcarbodiimide were added to a solution of 2.6 g of the product of Step A in 40 ml of methylene chloride and the mixture was stirred for 10 minutes. 2 g of (S)α-cyano-3-phenoxy-benzyl alcohol were added to the mixture which was stirred for 10 minutes after which 25 mg of 4-dimethylamino-pyridine were added thereto. The mixture was stirred for 90 minutes and was filtered and the filtrate was evaporated to dryness under reduced pressure. The residue was chromatographed over silica gel and was eluted with a 95-5 cyclohexane-ethyl acetate mixture to obtain 0.743 g of (S)α-cyano-3-phenoxy-benzyl (1R,cis) 2,2-dimethyl-3(E)-[2-propoxycarbonyl-ethenyl]-cyclopropane-1-carboxylate and 3.64 g of a mixture. The latter was dissolved in 4 volumes of hot isopropyl ether and the mixture was stirred at 20° C. and was then vacuum filtered to obtain another 2.32 g of the desired ester melting at 68° C.

Provenance & Evidence