An efficient one-potmethod for the regioselective bromination of allylicalcoholderivatives (two-step reaction sequence) followed by Sonogashira, Negishi, or Suzuki–Miyaura coupling reactions in the same reaction vessel (three-step reaction sequence) has been developed. The key reaction in these one-pot systems is the regioselective DBU-promoted trans HBr elimination of vicinal dibromides bearing
TBAF-Promoted Elimination of Vicinal Dibromides Having an Adjacent O-Functional Group: Syntheses of 2-Bromoalk-1-enes and Alkynes
作者:Noriki Kutsumura、Takao Saito、Keisuke Kubokawa
DOI:10.1055/s-0030-1260089
日期:2011.8
2-bromoalk-1-enes and alkynes were achieved in good yields by dehydrobromination of vicinaldibromides with tetrabutylammonium fluoride. Neighboring O-functional-group participation is important in determining elimination reactivity. tetrabutylammonium fluoride - elimination - 2-bromoalk-1-enes - alkynes - vicinaldibromides
Novel One-Pot Method for Chemoselective Bromination and Sequential Sonogashira Coupling
作者:Noriki Kutsumura、Kentaro Niwa、Takao Saito
DOI:10.1021/ol101110v
日期:2010.8.6
An efficient one-pot method for bromination-elimination of allyl alcohol derivatives and sequential Sonogashira coupling has been developed. A highlight of the method is chemoselective DBU-promoted elimination of vicinal dibromoalkanes having an adjacent O-functional group.