Pentane → Ethyl p-[2-(1,2,3,4-tetrahydro-1,4,4-trimethyl-7-quinolinyl)propenyl]benzoate

Participants

Reaction Steps

2.9 g of a 50% suspension of sodium hydride in mineral oil were suspended in 30 ml of dimethylformamide after two-fold washing with pentane and treated dropwise at room temperature with a solution of 17.3 g of diethyl (4-carbethoxybenzyl)phosphonate in 50 ml of dimethylformamide. After stirring at room temperature for 1 hour, a solution of 5 g of 1,2,3,4-tetrahydro-1,4,4-trimethyl-7-quinolinyl methyl ketone in 50 ml of dimethylformamide was added dropwise thereto. The reaction mixture was heated to 50° C. for 1 hour, poured on to ice/water and extracted with ethyl acetate. The brownish oil obtained after drying and evaporation of the organic phase was chromatographed (silica gel, eluting agent hexane/ethyl acetate=9:1) and gave 4.2 g of ethyl p-[2-(1,2,3,4-tetrahydro-1,4,4-trimethyl-7-quinolinyl)propenyl]benzoate as a slightly yellow, viscous oil.

Provenance & Evidence