synthetic utility of the present methodology has been demonstrated in the highly selective synthesis of side chain (4) of scyphostatin in 28% yield over nine steps in the longest linear sequence from allyl alcohol. Thus, this newtandem protocol has been emerged as the most widely applicable and highly selective route to trisubstituted alkenes including those that are otherwise difficult to prepare.
Synthesis of ethynylidene cyclopentanes by a cyclisation catalyzed by the simultaneous presence of palladium (0) and copper (I)
作者:Didier Bouyssi、Geneviève Balme、Jacques Gore
DOI:10.1016/0040-4039(91)80215-r
日期:1991.11
Ethynylidene cyclopentanes can be formed in 35–71% yield from the reaction of the enolates of compounds such as δ-acetylenic malonates with 1-halogeno-1-alkynes. This reaction requires catalysis by both palladium (0) and copper (I) species.
Cascade annulations of aryldiazonium salts, nitriles and halo-alkynes leading to 3-haloquinolines
作者:Mani Ramanathan、Shiuh-Tzung Liu
DOI:10.1016/j.tet.2017.05.085
日期:2017.7
A regiospecific access to 3-haloquinolines has been developed via a three-component annulation of aryldiazonium salts, nitriles and haloalkynes. This reaction proceeds through an initial formation of reactive nitrilium ion and further cascade annulation with haloalkynes. This method provides a straightforward access to a diverse array of functionalized quinolones (28 examples) under mild conditions
Iodination of organotrifluoroborates: synthesis of vinyl and alkynyl iodides
作者:George W. Kabalka、Arjun Reddy Mereddy
DOI:10.1016/j.tetlet.2003.12.050
日期:2004.2
Vinyl- and alkynyltrifluoroborates are rapidly converted to vinyl and alkynyliodides under mild conditions using sodium iodide in the presence of chloramine-T. The reaction is stereospecific and proceeds in excellent yield.
An Alkynyliodide Cycloaddition Strategy for the Construction of Iodoisoxazoles
作者:James A. Crossley、Duncan L. Browne
DOI:10.1021/jo1011174
日期:2010.8.6
The thermally promoted cycloaddition between alkynyliodides and nitrite oxides is reported. The process offers excellent regioselectivity and a broad scope with respect to both the iodoalkynes and chloro-oximes. Further functionalization of the highly decorated iodoisoxazole motifs can be achieved via Suzuki cross-coupling.