Transposition oxy-cope assistee par le trifluoroacetate mercurique en quantite stoechiometrique et en quantite catalytique
作者:Norbert Bluthe、Max Malacria、Jacques Gore
DOI:10.1016/0040-4020(84)85011-5
日期:1984.1
Tertiary 1,5-hexadien-3-ols are transformed at room temperature into δ-ethylenic ketones in 35-90%, yields under two sets of conditions: treatment with one molar equivalent of mercuric trifluoroacetate followed by demercuration of the intermediate α-mercuro ketone with sodium borohydride; and treatment with 0.2 molar equivalent of t of lithium trifluoroacetate or trifluorométhansulfonate. The reactions
Allylic alcohols were readily converted into allylic iodides by hydrogen iodide generated in situ from chlorotrimethylsilane/sodium iodide and water, or alcohols, under mild conditions. Displacement of allylic alcohols containing a terminal double bond gave allylic iodides accompanied by allylic rearrangement. This procedure has successfully been extended to a one-pot synthesis of homoallylic alcohols by carrying out successive Barbier type reactions.
APPLICATIONS OF THE TANDEM [2,3]-WITTIG-OXY-COPE REARRANGEMENT TO SYNTHESES OF<i>exo</i>-BREVICOMIN AND OXOCRINOL. THE SCOPE AND LIMITATION OF THE SIGMATROPIC SEQUENCES AS A SYNTHETIC METHOD FOR δ,ε-UNSATURATED KETONES
作者:Koichi Mikami、Takeshi Nakai
DOI:10.1246/cl.1982.1349
日期:1982.9.5
The synthetic utility of the title sigmatropicsequence is illustrated in the syntheses of E-6-nonen-2-one, a precursor of exo-brevicomin, and oxocrinol. The scope and limitation of this sequence as a synthetic method for δ,e-unsaturated ketones are also discussed.
Synthesis of homoallyl alcohols by the reaction of π-allyldicyclopentadienyltitanium(III) with carbonyl compounds
作者:Fumie Sato、Satoshi Iijima、Masao Sato
DOI:10.1016/0040-4039(81)80066-4
日期:1981.1
Reaction of π-allyldicyclopentadienyititanium(III) complexes, preformed or formed in situ, with aldehydes or ketones proceeds with regiospecificity, high stereoselectivity and chemospecificity, affording, under mild conditions, the corresponding homoallyl alcohols after hydrolysis in excellent yields.