(Trimethylsilyl)methyl allylic sulfones in intramolecular 4 + 3 cycloadditions
摘要:
Treatment of (trimethylsilyl)methyl allylic sulfones tethered to a furan with trimethylaluminum results in the formation of products derived from the intramolecular 4 + 3 cycloaddition of the corresponding allylic cations. 2,5-Disubstitution on the furan precludes the formation of cycloadducts and results in two different classes of products which apparently result from ipso or ortho attack of the allylic cation on the furan ring followed by trapping of the resulting oxonium ions by trimethylaluminum.
Intramolecular 4 + 3 Cycloadditions. Further Studies of (Trimethylsilyl)methyl Allylic Sulfones
作者:Michael Harmata、Barry F. Herron、Mehmet Kahraman、Charles. L. Barnes
DOI:10.1021/jo970511c
日期:1997.8.1
Harmata Michael, Herron Barry F., J. Org. Chem, 58 (1993) N 26, S 7393-7396
作者:Harmata Michael, Herron Barry F.
DOI:——
日期:——
(Trimethylsilyl)methyl allylic sulfones in intramolecular 4 + 3 cycloadditions
作者:Michael Harmata、Barry F. Herron
DOI:10.1021/jo00078a017
日期:1993.12
Treatment of (trimethylsilyl)methyl allylic sulfones tethered to a furan with trimethylaluminum results in the formation of products derived from the intramolecular 4 + 3 cycloaddition of the corresponding allylic cations. 2,5-Disubstitution on the furan precludes the formation of cycloadducts and results in two different classes of products which apparently result from ipso or ortho attack of the allylic cation on the furan ring followed by trapping of the resulting oxonium ions by trimethylaluminum.
The Synthesis of Trimethylsilylmethyl Allylic Sulfones
作者:Michael Harmata、Barry F. Herron
DOI:10.1055/s-1993-25828
日期:——
3-Arylsulfonyl-2-[(trimethylsilyl)methyl]alkenes are easily prepared by the reaction of trimethylsilylmethyl cuprates with the appropriate 1-(arylsulfonyl)alka-1,2-dienes.