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
Synthesis of Farnesol Analogues through Cu(I)-Mediated Displacements of Allylic THP Ethers by Grignard Reagents
作者:Mark F. Mechelke、David F. Wiemer
DOI:10.1021/jo990161p
日期:1999.6.1
The synthesis of a family of farnesol analogues, incorporating aromatic rings, has been achieved in high yields through the development of a regioselective coupling of allylic tetrahydropyranyl ethers with organometallic reagents. The allylic THP group is displaced readily by Grignardreagents in the presence of Cu(I) halides but is stable in the absence of added copper. Thus, an allylic THP group
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.
Selective hydrogenation of substituted dienes catalyzed by an organoyttrium complex
作者:Gary A. Molander、John O. Hoberg
DOI:10.1021/jo00038a004
日期:1992.6
Cp*2YMe(THF) has been developed as an efficient catalyst for the selective reduction of substituted dienes.
Allylic Rearrangements. XXXV. The Reactions of the Sodium Derivative of Allylbenzene in n-Pentane with Methanol, Alkyl and Allylic Halides<sup>1a</sup>