Synthesis of enantiopure 2,4,8,10-tetrasubstituted Tröger base derivatives
摘要:
Chiral tetramethyl and dibromo-dimethyl substituted Trager base derivatives are readily prepared in enantiomerically pure forms using camphor sulfonic acid as a resolving agent. The (S,S)-isomers of these derivatives were obtained with 95-99% ee by precipitation using (1S)-(+)-10-camphor sulfonic acid and the partially resolved samples present in the mother liquor were enriched by treatment with (1R)-(-)-10-camphor sulfonic acid to obtain the (R,R)-isomers of tetrasubstituted Trifiger base derivatives with 96-99% ee. In the case of 2,8-dibromo-4,10-dimethyl derivative, the (R,R)-isomer was obtained with 96-97% ee from the filtrate fraction after the (S,S)-enantiomer precipitated out. The dibromo derivative is readily functionalized to access a new chiral amine system containing a chiral phenylethylamine moiety. (C) 2015 Elsevier Ltd. All rights reserved.
Synthesis of enantiomerically pure Tröger's base derivatives via chiral disulfoxides
作者:Pavol Ondrisek、Rino Schwenk、Ján Cvengroš
DOI:10.1039/c4cc03963g
日期:——
The preparation, full characterization and determination of the absolute configuration of diastereomericallypure disulfoxide derivatives of Troger's base are described. A sulfinyl-lithium exchange followed by the reaction with electrophiles affords synthetically meaningful amounts of enantiomerically pure 4,10-disubstituted Troger's base analogues without any erosion of the stereogenic information