Stereoselective Hydrosilylation of Enals and Enones Catalysed by Palladium Nanoparticles
作者:Meryem Benohoud、Sakari Tuokko、Petri M. Pihko
DOI:10.1002/chem.201100655
日期:2011.7.18
A highly versatile and efficient hydrosilylation method by palladium nanoparticle catalysis allows the direct and chemoselective synthesis of 1) enolsilanes of high isomeric purity, 2) saturated aldehydes or ketones, or 3) the corresponding saturated acetals from α,β‐unsaturated aldehydes or ketones. The choice of the product is determined by simply switching the solvent from THF to mixtures of THF/water
Synthesis of N-propargylanabasine derivatives by the mannich reaction
作者:M. V. Mavrov、S. G. Zlotin
DOI:10.1007/s11172-007-0256-0
日期:2007.8
N-Propargylanabasine derivatives bearing various substituents at the carbon atom of the alkyne fragment were obtained by the reaction of anabasine hydrochloride with terminal alkynes and paraformaldehyde. The reaction proceeded with retention of the C(2) chiral center in anabasine fragment. The by-products of the reaction, including 1,3-diacetylene (the products of dimerization of alkynes) and conjugated
Evidence for Atropisomerism in Polycyclic γ‐Butenolides: Synthesis, Scope, and Spectroscopic Studies
作者:Debayan Roy、Beeraiah Baire
DOI:10.1002/chem.202005174
日期:2021.2.24
Design and development of a domino cyclative approach for the synthesis of new polycyclic γ‐butenolides from β‐aryl‐Z‐enoate propargylic alcohols, through the interception of an intermediate of the Z‐enoate‐assisted Meyer–Schuster rearrangement, has been reported. A systematic NMR analysis of various derivatives of this class revealed and supported the potential atropisomerism associated with them
(Bpin)2 as the boron reagent in dimethyl sulfoxide at room temperature. Both terminal and internal propargyl alcohols with diverse structures and functional groups underwent the transformation smoothly to produce β-Bpin-substituted (E)-allylic alcohols, of which the synthetic potentials were demonstrated by the downstream conversions of boronate, alkenyl, and hydroxylgroups.
The Z-enoate assisted, Meyer–Schuster rearrangement cascade: unconventional synthesis of α-arylenone esters
作者:Prabhakararao Tharra、Beeraiah Baire
DOI:10.1039/c6cc06639a
日期:——
Bronstead acid promoted nucleophilation of proaprgylic aclohols during Meyer-Schuster rearrangement (M-S) has been introduced. A novel convept of reverse polarization of the M-S intermediate allenyl cation has been realized by...