novel three-component reaction of alkadienol, CO2, and aryl or vinylic halide gives a vinyl group-substituted cyclic carbonate in one pot in the presence of a catalytic amount of a palladium complex. 2,3-Alkadienol affords five-membered ring carbonate in good yield, while 3,4-alkadienol effects the six-membered one successfully. 2,4-Alkadienol also takes part in this reaction to provide five-membered
Vanadium-Catalyzed Coupling of Allenols with Electrophilic Halide Sources for the Formation of α-Halo-α′,β′-unsaturated Ketones
作者:Barry M. Trost、Jacob S. Tracy、Tas Yusoontorn
DOI:10.1021/acs.orglett.9b00195
日期:2019.2.15
metal enolate formed from the 1,3-transposition of an allenol that is initiated by a cheap and earth-abundant vanadium oxo catalyst. Fluorine, chlorine, and bromine electrophiles can be utilized, and the resulting products can give rise to the introduction of nitrogen, oxygen, sulfur, and iodine nucleophiles α to the ketone through substitution chemistry.
Carbon–Nitrogen Bond Formation via the Vanadium Oxo Catalyzed Sigmatropic Functionalization of Allenols
作者:Barry M. Trost、Jacob S. Tracy
DOI:10.1021/acs.orglett.7b00961
日期:2017.5.19
electrophilic nitrogen sources is reported even in the presence of competing simple protonation and Alder-ene pathways. Hydrazine products can be cyclized in a 6-endo-trig fashion which, upon reductivecleavage of the N–N bond, yield 1,4-diamines. Additionally, cleavage of the N–N bond before cyclization can be achieved to form β-hydroxy amines, a common structural motif of biologically active compounds.
Allenes and acetylenes. 22. Mechanistic aspects of the allene-forming reductions (SN2' reaction) of chiral propargylic derivatives with hydride reagents
作者:Alf Claesson、Lars-Inge Olsson
DOI:10.1021/ja00518a028
日期:1979.11
Vanadium-Catalyzed anti-Selective Additions of Allenols to Imines