Highly Efficient Synthesis of 1,1-Difluoro-2-substituted-1,3-dienes and Dienynes from gem-Difluorohomoallenyl Bromide via Palladium-Catalyzed Cross-Coupling Reactions
摘要:
[GRAPHICS]A stable gem-difluoroallenylindium 1 is readily transformed to a potentially bifunctional electrophile 2, which can then undergo a transition-metal-promoted isomerization-cross coupling cascade to yield diene 3 and dienyne 4 in very high yields.
Regiospecific Synthesis of Bicyclo- and Heterobicyclo-<i>g</i><i>em</i>-difluorocyclobutenes Using Functionalized Fluoroallenes and a Novel Mo-Catalyzed Intramolecular [2 + 2] Cycloaddition Reaction
作者:Qilong Shen、Gerald B. Hammond
DOI:10.1021/ja0263893
日期:2002.6.1
The first synthesis of functionalized gem-difluoroallenes 4 served as platform for an unprecedented molybdenum-catalyzed intramolecular allene-alkyne [2 + 2]-cycloaddition that produced 6, a hitherto unknown class of bicyclo- and heterobicyclo-CF2-containing cyclobutenes.
Highly Efficient Synthesis of 1,1-Difluoro-2-substituted-1,3-dienes and Dienynes from <i>g</i><i>em</i>-Difluorohomoallenyl Bromide via Palladium-Catalyzed Cross-Coupling Reactions
作者:Qilong Shen、Gerald B. Hammond
DOI:10.1021/ol0160654
日期:2001.7.1
[GRAPHICS]A stable gem-difluoroallenylindium 1 is readily transformed to a potentially bifunctional electrophile 2, which can then undergo a transition-metal-promoted isomerization-cross coupling cascade to yield diene 3 and dienyne 4 in very high yields.