Siloxyallenes revisited. A useful functional intermediate for the synthesis of (Z)-β-branched Morita–Baylis–Hillman type adducts and (Z)-chalcones
作者:Kazuhiro Yoshizawa、Takayuki Shioiri
DOI:10.1016/j.tet.2007.02.025
日期:2007.7
Siloxyallenes proved to be a usefulfunctionalintermediate in the preparation of (Z)-β-branched Morita–Baylis–Hillman type adducts by the reaction of aldehydes with silylacetylenes or siloxypropynes. Various (Z)-chalcones were stereoselectively synthesized from siloxypropynes via siloxyallenes.
Construction of the 1,5-Benzodiazepine Skeleton from <i>o</i>-Phenylendiamine and Propargylic Alcohols via a Domino Gold-Catalyzed Hydroamination/Cyclization Process
The gold-catalyzed reaction of o-phenylendiamine with propargylic alcohols affords 1,5-benzodiazepines bearing different substituents on the 2 and 4 positions. The method allows even for the selective preparation of 4-substituted 1,5-benzodiazepine derivatives.
A novel ytterbium(III) trifluoromethanesulfonate [Yb(OTf)3]‐catalyzed ring‐opening C(sp3)−N bond formation reaction of benzoxazole with propargylic alcohols was established. This reaction uses readily available starting materials and is operationally simple; it thus represents a practical method for the construction of highly functionalized substituted benzenes bearing aldehyde, propargylamine, and
Rhodium-Catalyzed/Copper-Mediated Tandem C(sp<sup>2</sup>)–H Alkynylation and Annulation: Synthesis of 11-Acylated Imidazo[1,2-<i>a</i>:3,4-<i>a</i>′]dipyridin-5-ium-4-olates from 2<i>H</i>-[1,2′-Bipyridin]-2-ones and Propargyl Alcohols
作者:Ting Li、Zhiqiang Wang、Kun Xu、Wenmin Liu、Xu Zhang、Wutao Mao、Yongming Guo、Xiaolin Ge、Fei Pan
DOI:10.1021/acs.orglett.6b00177
日期:2016.3.4
A rhodium-catalyzed/copper-mediated tandem C(sp2)–H alkynylation and intramolecular annulation of 2H-[1,2′-bipyridin]-2-ones with propargyl alcohols for the synthesis of 11-acylated imidazo[1,2-a:3,4-a′]dipyridin-5-ium-4-olates is described.
铑催化/铜介导的串联C(sp 2)-H炔基化反应和2 H- [1,2'-联吡啶] -2-酮与炔丙醇的分子内环化反应,合成11-酰化的咪唑[1,描述了2- a:3,4- a ']双吡啶-5-鎓-4-油酸酯。