Diisopropylamine → HCID 20130467, compound

Participants

Reaction Conditions

Reaction Steps

A solution of lithium diisopropylamide (LDA), prepared at 0° C. under a nitrogen (N2) atmosphere from diisopropylamine (0.311 mol, 31.4 g) and n-butyllithium (0.311 mol, 2.7M, 115.3 ml) using tetrahydrofuran (400 ml) as solvent, was cooled to -78° C. employing a dry ice/acetone slurry. Ethyl 6-phenyl-3-cyclohexene-1-carboxylate (0.283 mol, 65 g) dissolved in tetrahydrofuran (100 ml) was added to the solution. After 45 min., 1-chloro-3-iodopropane (0.311 mol, 63.5 g) dissolved in tetrahydrofuran (50 ml) was added dropwise over the period of 30 min. The contents were allowed to warm to room temperature, whereupon 300 ml of water is added and the mixture was extracted three times with 200 ml of ethyl ether. The combined organic extracts were washed with 10% aqueous sodium thiosulfate and brine and dried over magnesium sulfate (MgSO4). Upon filtration, the filtrate was concentrated in vacuo to afford a yellow oil which is distilled (155°-160° C./0.05 mm) to afford ethyl-1-(3-chloropropyl)-6-phenyl-3-cyclohexene-1-carboxylate (66.75 g, 77% yield).

Provenance & Evidence