Ammonium Chloride → Ethyl 4-methylidenecyclohexane-1-carboxylate

Participants

Reaction Steps

To a suspension of MePh3PBr (37.1 g, 104 mmol) in THF (500 mL) at 0° C. was added slowly LDA (1.2 eq) over 1 h. The resulting orange solution was stirred for 30 min before ethyl 4-oxocyclohexanecarboxylate (16.1 g, 94.4 mmol) was added dropwise. The resulting suspension was warmed to rt and stirred overnight (may not necessary). A saturated NH4Cl (aq) was added and THF was removed. The aqueous residue was extracted with EtOAc (100*3). The combined organic layers were washed with brine, dried over Na2SO4 and concentrated. The residue was purified by passing through a short silica gel plug (hexanes/EtOAc 7:1). After being concentrated, ethyl 4-methylenecyclohexanecarboxylate was obtained as pale yellow oil (12.1 g, 76%).

Provenance & Evidence