I found this synthesis online for pcp and it looks legit to me but does anyone else know for sure? A mixture of 170 g of piperidine, 220 g of cyclohexylamine, and 750 ml of benzene is azeotropically distilled until the evolution of H20 stops, then vacuum distill to get cyclohexenyl-piperidine. p-toluenesulfonic acid monohydrate (190 g) in 250 ml of PhMe is heated under a water trap until all the H20 is removed, then add a solution of 165 g of cyclohexyl-piperidine in 500 ml of Et20, with cooling, to keep temp at 0í. A solution of I mole of PhMgBr (made from 157 g of PhBr and 24 g of Mg) in 750 ml of Et20 is added (still holding the temp at 0í to 5í). The mixture is stirred for an additional 30 min after the dropwise addition is complete. Decompose the mixture by adding an excess saturated NH4Cl and NH40H. The Et20 layer is removed, dried over K2CO3, and distilled to give phenylcyclohexylpiperidine. Convert to the hydrochloride form by dissolving the free base in an excess of iso-PrOH-HC1 and then precipitate the salt (the hydrochloride) with Et20 and crystallize from Et20-iso-PrOH (this is a mixture). If so, anyone have any tips or comments?
