Novel One-Pot Method for Chemoselective Bromination and Sequential Sonogashira Coupling
摘要:
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.
TBAF-Promoted Dehydrobrominations of Vicinal Dibromides Having an Adjacent O-Functional Group
作者:Noriki Kutsumura、Takao Saito、Keisuke Kubokawa
DOI:10.1055/s-0030-1258813
日期:2010.11
Regioselective HBr elimination of vicinal dibromides having an adjacent oxygen functional group to give the corresponding 2-bromoalk-1-enes was controlled using 1.1 equivalents of TBAF. Two-step elimination to give the corresponding alkynes was controlled using 5.0 equivalents of TBAF. High yield and high selectivity require the presence of an oxygen functional group at the neighboring position of the elimination site.
1,8-Diazabicyclo[5.4.0]undec-7-ene-promoted Regioselective Elimination of Vicinal Dibromides Having an Adjacent<i>O</i>- and/or<i>N</i>-Functional Group
We have investigated the DBU-promoted HBr-elimination of vicinaldibromides having an adjacent O- and/or N-functional group under mild basic conditions. The elimination of 1-oxygen-functionalized 2...
我们研究了在温和的碱性条件下 DBU 促进 HBr 消除具有相邻 O 和/或 N 官能团的邻位二溴化物。消除 1-氧功能化的 2...
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.