Preparation and resolution of 2,2′-dimercapto-6,6′-dimethoxy-1,1′-biphenyl: a C2-symmetric sulfur building block
作者:Giovanna Delogu、Davide Fabbri、Maria Antonietta Dettori
DOI:10.1016/s0957-4166(98)00278-x
日期:1998.8
The preparation of the title dimercaptan 1 starting from 2,2'-dihydroxy-6,6'-dimethoxy-1,1'-biphenyl 2 is described, Resolution of dimercaptan 1 was performed using (-)-(1R,2S,5R)-menthyl chloroformate as a chiral resolving agent. The procedure affords dimercaptan (+)-1 and (-)-1 in 98% ee and 93% ee, respectively. A new and direct intermolecular Ullmann coupling resulting in an improved preparation of diol 2 is also reported. (C) 1998 Elsevier Science Ltd. All rights reserved.