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...
2-Bromoallyl Acetate: A Useful Structural Unit for Sequential Carbon−Carbon Bond Formation
作者:Richard E. Taylor、Jeffrey P. Ciavarri
DOI:10.1021/ol9900865
日期:1999.8.1
[GRAPHICS]2-Bromoallyl acetate has been shown to be an efficient substrate for Ni(II)/Cr(II) mediated coupling reactions with a variety of aliphatic and aryl aldehydes, Surprisingly, elimination of acetate from the intermediate vinylchromium species does not appear to compete with carbon-carbon bond formation. In addition, the allylic acetate products have been shown to be useful allyl nucleophile precursors through palladium mediated reactions. These results suggest that acyloxyalkenyl bromides are efficient linchpins for multiple carbon-carbon bond formation.
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