已经发现,在5mol%的碘化亚铜(I)存在下,格氏试剂可将磺酰基活化的sp 3碳-氮键裂解。重要的是,广泛的磺酰基活化的苄基,烯丙基和炔丙基胺与格利雅试剂进行平滑的交叉偶联反应,从而提供结构多样的偶联产物,收率高至优异,并具有较高的化学,区域和立体选择性。此外,已经证明S N 2机理参与交叉偶联反应,该交叉偶联反应允许由旋光的α-支化胺衍生物不对称地合成手性烃。
Reactions of 2-alkenyl methyl ether with phenyl, trimethylsilylmethyl, and allyl Grignard reagents in the presence of cobalt(II) complexes are discussed. The success of the reactions heavily depends on the combination of the substrate, ligand, and Grignard reagent. In the reaction of cinnamyl methyl ether, the formation of the linear coupling products predominates over that of the relevant branched
Copper-Catalyzed Regioselective Allylic Substitution Reactions with Indium Organometallics
作者:David Rodríguez、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1021/jo0265939
日期:2003.3.1
The first nucleophilic allylic substitution reactions of triorganoindiumcompounds with allylic halides and phosphates are reported. The reactions of trialkyl- and triarylindium reagents with cinnamyl and geranyl halides and phosphates, with the aid of copper catalysis [Cu(OTf)(2)/P(OEt)(3)], are described. In general, the reaction proceeds efficiently to give good yields and regioselectively to afford
presence of CoCl 2 [1,5-bis(diphenylphosphino)pentane] affords 1,3-diphenylpropene in good yield. Similar allylic substitutionreaction with trimethylsilylmethylmagnesium chloride proceeded smoothly to yield homoallylsilanes. α,β-Unsaturated aldehyde acetal also underwent allylic substitution.
Preparation of Allyl and Vinyl Silanes by the Palladium-Catalyzed Silylation of Terminal Olefins: A Silyl-Heck Reaction
作者:Jesse R. McAtee、Sara E. S. Martin、Derek T. Ahneman、Keywan A. Johnson、Donald A. Watson
DOI:10.1002/anie.201200060
日期:2012.4.10
high‐yielding protocol for the palladium‐catalyzed silylation of terminal alkenes is reported. This method allows facileconversion of styrenes to E‐β‐silyl styrenes by using iodotrimethylsilane (TMSI) or chlorotrimethylsilane/lithium iodide (see scheme). Terminal allyl silanes with good E/Z ratios are also readily accessed from α‐olefins.
REGIOSELECTIVE SYNTHESIS OF 3-ALKENYLSILANES AND 3-ALKENYLSTANNANES BY SILICON- AND TIN-DIRECTED ELIMINATION FROM γ-SILYL AND γ-STANNYL SUBSTITUTED SULFOXIDES AND SULFILIMINES<sup>1</sup>)
作者:Akira Hosomi、Masahiro Inaba、Hideki Sakurai
DOI:10.1246/cl.1983.1763
日期:1983.11.5
3-Alkenylsilanes and 3-alkenylstannanes are conveniently prepared by the silicon- and tin-directed regioselective elimination of sulfenic acid and sulfenamide from γ-silyl and γ-stannyl substituted sulfoxides and sulfilimines.