Approaches to the synthesis of (+)- and (−)-epibatidine †
作者:M. Teresa Barros、Christopher D. Maycock、M. Rita Ventura
DOI:10.1039/b002980g
日期:——
Synthetic approaches to the powerful analgesic alkaloids (+)- and (â)-epibatidine are described. The starting material employed was natural (â)-quinic acid from which chiral enones and α-iodoenones were prepared. Stille coupling afforded suitable substrates for completion of the syntheses. A key step in this process was the diastereoselective reduction of a cyclohexanone with sodium borohydride and DMSO which sets up the stereochemistry necessary for the formation of the bicycloheptane system. The synthesis of a previously reported enone intermediate has also been improved.
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The effect of DMSO on the borohydride reduction of a cyclohexanone: A formal enantioselective synthesis of (+)-epibatidine
作者:M.Teresa Barros、Christopher D. Maycock、M.Rita Ventura
DOI:10.1016/s0040-4039(98)02354-5
日期:1999.1
An asymmetric synthesis of (+)-epibatidine is described which uses the increased stereoselectivity of a borohydride reduction induced by the presence of DMSO. (C) 1998 Elsevier Science Ltd. All rights reserved.
Enantioselective α-Arylation of Cyclohexanones with Diaryl Iodonium Salts: Application to the Synthesis of (−)-Epibatidine