作者:Kui Zhang、Lingchao Cai、Zhongyue Yang、K. N. Houk、Ohyun Kwon
DOI:10.1039/c7sc04381c
日期:——
A novel bridged [2.2.1] bicyclic phosphineoxide, devised to circumvent the waste generation and burdens of purification that are typical of reactions driven by the generation of phosphineoxides, has been prepared in three steps from commercially available cyclopent-3-ene-1-carboxylic acid. The performance of this novel phosphineoxide was superior to those of current best-in-class counterparts, as
Phosphine-Mediated Iterative Arene Homologation Using Allenes
作者:Kui Zhang、Lingchao Cai、Xing Jiang、Miguel A. Garcia-Garibay、Ohyun Kwon
DOI:10.1021/jacs.5b07403
日期:2015.9.9
A PPh3-mediated multicomponent reaction between o-phthalaldehydes, nucleophiles, and monosubstituted allenes furnishes functionalized non-C-2-symmetric naphthalenes in synthetically useful yields. When the o-phthalaldehydes were reacted with 1,3-disubstituted allenes in the presence of PPh2Et, naphthalene derivatives were also obtained in up to quantitative yields. The mechanism of the latter transformation is straightforward: aldol addition followed by Wittig olefination and dehydration. The mechanism of the former is a tandem gamma-umpolung/aldol/Wittig/dehydration process, as established by preparation of putative reaction intermediates and mass spectrometric analysis. This transformation can be applied iteratively to prepare anthracenes and tetracenes using carboxylic acids as pronucleophiles.
HIMBERT, G.;FINK, D., TETRAHEDRON LETT., 1985, 26, N 36, 4363-4366
作者:HIMBERT, G.、FINK, D.
DOI:——
日期:——
HIMBERT, GERHARD;FINK, DIETER;DIEHL, KLAUS, CHEM. BER., 121,(1988) N 3, 431-441