Novel addition reactions of titanacycle phosphonates by tuning of Ti(O-i-Pr)4/2i-PrMgClElectronic supplementary information (ESI): further experimental details. See http://www.rsc.org/suppdata/cc/b2/b209149f/
作者:Abed Al Aziz Quntar、Morris Srebnik
DOI:10.1039/b209149f
日期:2003.12.19
Di- or tri-substituted vinylphosphonates, 2–5, can be obtained in a highly regio- and stereoselective manner from 1-alkynylphosphonates, by manipulation of Ti(O-i-Pr)4/2i-PrMgCl.
Enantioselective Synthesis of Optically Active Alkanephos- phonates<i>via</i>Rhodium-Catalyzed Asymmetric Hydrogenation of β-Substituted α,β-Unsaturated Phosphonates with Ferrocene-Based Monophosphoramidite Ligands
series of chiral β-substituted alkanephosphonates was synthesized in high enantioselectivities via the first rhodium-catalyzedasymmetrichydrogenation of the corresponding β-substituted-α,β-unsaturated phosphonates using a ferrocene-derived monophosphoramidite ligand, with which up to 99.5% ee have been achieved for the hydrogenation of (E)-substrates and 98.0% ee for (Z)-substrates.
Novel Vinyl Phosphonates and Vinyl Boronates by Halogenation, Allylation, and Propargylation of α-Boryl- and α-Phosphonozirconacyclopentenes
作者:Shoshana Ben-Valid、Abed Al Aziz Quntar、Morris Srebnik
DOI:10.1021/jo047913m
日期:2005.4.1
bromination, iodination, allylation, and propargylation to generate unique vinyl boronates and vinylphosphonates not obtainable by other methods. The reaction proceeds in two steps, with both high regio- and stereoselectivity. With the vinyl boronates, the Zr−Csp2 bond is initially cleaved by 1 equiv of electrophile. With the phosphonates, either the Zr−Csp2 bond (allyl bromide, Br2) or the Zr−Csp3 bond (I2