Generation, rearrangements and some synthetic uses of bishomoallyllithiums
作者:Fangping Chen、Boguslaw Mudryk、Theodore Cohen
DOI:10.1016/s0040-4020(01)81201-1
日期:1994.1
bishomoallyllithiums rearrange to primary bishomoallyllithiums via cyclobutylcarbinyllithium intermediates. An oxyanionic group on a carbon atom adjacent to the lithium-bearing carbon atom has a remarkable accelerating effect on the ringclosure to a 4-membered ring. Formylation of some bishomoallyllithiums affords the precursors of type-II intramolecularenereactions, which generate six membered ring compounds
Cohen Theodore, Zhang Birong, Cherkauskas John P., Tetrahedron, 50 (1994) , S 11569-11584
作者:Cohen Theodore, Zhang Birong, Cherkauskas John P.
DOI:——
日期:——
Chen Fangping, Mudryk Boguslaw, Cohen Theodore, Tetrahedron, 50 (1994) N 45, S 12793-12810
作者:Chen Fangping, Mudryk Boguslaw, Cohen Theodore
DOI:——
日期:——
A general preparative method for carbonyl-protected γ-lithioketones via reductive lithiation. Synthetic uses of the bishomoenolate equivalents
作者:Theodore Cohen、Birong Zhang、John P. Cherkauskas
DOI:10.1016/s0040-4020(01)85652-0
日期:1994.1
react with aldehydes to yield alcohols. The vinyllithiums react with N,N-dimethylformamide to produce an enal containing a protected ketone group. The mixed cuprates, formed upon treatment of the organolithiums with cuprous bromide - dimethyl sulfide complex, undergo allylation with allyl bromide, conjugateaddition to enals and enones in the presence of trimethylsilylchloride to produce monoprotected