The Synthesis of Stereodefined Trisubstituted Olefins From Olefin Templates Using Pd Catalysis - Synthesis of the Antihypertensive Isbogrel
作者:Lawrence R. Rogers、Zissis Konstantinou、Madhav Reddy、Michael G. Organ
DOI:10.1002/ejoc.201100849
日期:2011.9
A collection of highly functionalized, trisubstituted olefin building blocks (templates) have been developed for their Pd-catalyzed elaboration into more complex structures, including natural products and compounds of medicinal chemistry interest. The Pd-mediated transformations involve a combination of allylic substitution and cross-coupling reactions. The templates have been designed such that these
Stereoselective synthesis of substituted all-trans 1,3,5,7-octatetraenes by a modified Ramberg–Bäcklund reaction
作者:Xiao-Ping Cao
DOI:10.1016/s0040-4020(01)01224-8
日期:2002.2
The reaction of allylic dienylic sulfone with dibromodifluoromethane in the presence of alumina-supported KOH in dichloromethane solution results in facile rearrangement affording the corresponding all-trans 1,3,5,7-octatetraenes in excellent yields. This result shows that the double bonds of stereochemically defined allylic dienylic sulfone retain their stereochemistry and the newly formed double
Expedient access to branched allylic silanes by copper-catalysed allylic substitution of linear allylic halides
作者:Devendra J. Vyas、Martin Oestreich
DOI:10.1039/b920793g
日期:——
An unprecedented copper-catalysed allylic transposition enables the regioselectivesynthesis of branched allylic silanes from linear allylichalides through direct C-Si bond formation.
Copper-Catalyzed SiB Bond Activation in Branched-Selective Allylic Substitution of Linear Allylic Chlorides
作者:Devendra J. Vyas、Martin Oestreich
DOI:10.1002/anie.201004658
日期:2010.11.2
The harder they come, the better they leave! Chloride is superior to all common leaving groups in the γ‐selective allylicsubstitution of linear precursors. This approach involves a novel copper‐catalyzed SiBbondactivation (see scheme; γ/α≥98:2, 7 examples; Si=SiMe2Ph and B=Bpin with pin=pinacolato).
他们来得越难,就越会离开!在线性前体的γ-选择性烯丙基取代中,氯化物优于所有常见的离去基团。这种方法涉及一种新型的铜催化的Si 乙键活化(参见方案;γ/α≥98:2,7例子;硅=森达2 P h和乙= BPIN与销=频哪醇)。
Intramolecular aromatic cyclizations of alkenyliodonium tetrafluoroborates
1,2-Dihydronaphthalene and 2H-chromene derivatives have been synthesized by thermal intramolecularcyclizations of alkenyliodoniumtetrafluoroborates under mild reaction conditions.