Facile synthesis of enantiopure trans-2,3-diphenyl-1,4-diazabicyclo[2.2.2]octane
作者:Ryu Oi、K. Barry Sharpless
DOI:10.1016/s0040-4039(00)93478-6
日期:1991.9
An efficient synthesis of enantiopure trans-2,3-diphenyl-1,4-diazabicyclo[2.2.2]octane (trans-2,3-diphenyl-DABCO) from enantiopure stilbene diamine is reported.
Racemic 2,3-diaryl-1,4-diazabicyclo[2.2.2]octane (DABCO) derivatives are synthesized from the readily accessible piperazines in 50–64% yield by cyclization using ethylene bromide, triethylamine, and KI at 80 °C. The enantiomerically enriched 2,3-diphenylpiperazine and the 2,3-bis(1-naphthyl)piperazine derivatives are prepared by a resolution method using commercially available optically active acids