Norchlorcyclizine → 1,4-Bis[(4-chlorophenyl)phenylmethyl]piperazine

Participants

Reaction Steps

A solution of 4-(4-chlorobenzhydryl)piperazine 1 (2 mmols) and chloro-(4-chlorophenyl)phenylmethane 21 (Aldrich, 2 mmols) in methylene chloride (10 mL) and Et3N (0.3 mL) is stirred under an inert atmosphere. The solution is warmed and the course of the reaction is followed by TLC. When the reaction is complete, dil. aq. Na2CO3 is added to the solution, shaken, and the layers are separated. The aqueous layer is extracted with additional CH2Cl2, the combined organic extracts are washed with half-saturated brine, dried (Na2SO4), filtered and concentrated under reduced pressure giving the crude product. The desired compound 1,4-bis-(4-chlorobenzhydryl)piperazine 22 is obtained by purification of the crude product with the use of HPLC.

Provenance & Evidence