Palladium-catalyzed Cycloaddition of Alkynyl Aryl Ethers to Allenes to Form a 2,3-Bismethylidene-2,3-dihydro-4<i>H</i>-1-benzopyran Framework
作者:Yasunori Minami、Mayuko Kanda、Tamejiro Hiyama
DOI:10.1246/cl.130894
日期:2014.2.5
Palladium-catalyzed cycloaddition of alkynyl aryl ethers to allenes proceeds through o-C–H activation to give 2,3-dihydro-4H-1-benzopyran derivatives containing 2,3-exo-double bonds. These benzopyr...
Cobalt-Catalyzed Regio- and Diastereoselective Formal [3 + 2] Cycloaddition between Cyclopropanols and Allenes
作者:Junfeng Yang、Qiao Sun、Naohiko Yoshikai
DOI:10.1021/acscatal.8b05114
日期:2019.3.1
reaction between a cyclopropanol and an allene viacyclopropanol ring opening, which affords a 3-alkylidenecyclopentanol derivative with high regio- and diastereoselectivities. The reaction tolerates monosubstituted, 1,1-disubstituted, and 1,3-disubstituted allenes and various functional groups. The reaction is proposed to proceed through carbometalation of the allene with a cobalt homoenolate followed by
Development of a New Spiro-BOX Ligand and Its Application in Highly Enantioselective Palladium-Catalyzed Cyclization of 2-Iodoanilines with Allenes
作者:Wei Shu、Qiong Yu、Shengming Ma
DOI:10.1002/adsc.200900607
日期:2009.11
In this communication, we report the synthesis of a new chiral spiro-bisoxazoline ligand, i.e., β-naphthylmethyl-substituted spiro-BOX [(Ra,S,S)-L7] and have successfully applied it to the palladium-catalyzedenantioselectivecyclization reaction of simple allenes with o-aminoiodobenzenes, affording highly optically active 3-alkylideneindolines in good yields with excellent enantiomeric excesses.
Regioselective Nickel-Catalyzed Reductive Couplings of Enones and Allenes
作者:Wei Li、Nan Chen、John Montgomery
DOI:10.1002/anie.201004740
日期:2010.11.8
Alkenes made easy: In a complement to coupling processes of terminal alkynes, the reductivecoupling of enones and allenes provides access to conjugate addition products that possess a 1,1‐disubstituted alkene (see scheme; cod=1,5‐cyclooctadiene). The solvent composition and reducing agent must be carefully matched to allow high levels of regioselectivity to be observed.
Highly Regioselective Palladium-Catalyzed Thiocarbonylation of Allenes with Thiols and Carbon Monoxide
作者:Wen-Jing Xiao、Giuseppe Vasapollo、Howard Alper
DOI:10.1021/jo972121w
日期:1998.4.1
CHCl(3)-PPh(3), Pd(PPh(3))(4), and Pd(OAc)(2)-dppp are also effective for this reaction. The thiocarbonylation reaction is believed to proceed via an allylpalladium intermediate. The reaction exhibits high regioselectivity, in which the thiophenyl group adds to the less substituteddouble bond of allenes to give beta,gamma-unsaturated thioesters.