A New Strategy for the Synthesis of Chiral β-Alkynyl Esters via Sequential Palladium and Copper Catalysis
作者:Barry M. Trost、Benjamin R. Taft、James T. Masters、Jean-Philip Lumb
DOI:10.1021/ja203171x
日期:2011.6.8
new strategy for the synthesis of chiral β-alkynyl esters which relies on sequential Pd and Cu catalysis is reported. Terminalalkynes bearing aryl, alkyl, and silyl groups can be employed without prior activation yielding a wide range of important chiral building blocks. The reaction sequence utilizes a robust Pd(II)-catalyzed hydroalkynylation of ynoates with terminalalkynes providing geometrically
A Short, Organocatalytic Formal Synthesis of (−)-Swainsonine and Related Alkaloids
作者:Vijay Dhand、Jason A. Draper、Jarod Moore、Robert Britton
DOI:10.1021/ol400566j
日期:2013.4.19
A shortsynthesis of hydroxyalkyl dihydropyrroles has been developed that involves the coupling of propargylamines with α-chloroaldehydes, followed by Lindlar reduction and a one-pot epoxide formation/opening sequence. The application of this process to the synthesis of unnatural iminosugars and a formalsynthesis of (−)-swainsonine is described.
Carboxylate-Catalyzed C-Silylation of Terminal Alkynes
作者:Anton Bannykh、Petri M. Pihko
DOI:10.1021/acs.orglett.3c04213
日期:2024.3.15
carboxylate-catalyzed, metal-free C-silylation protocol for terminalalkynes is reported using a quaternary ammonium pivalate as the catalyst and commercially available N,O-bis(silyl)acetamides as silylating agents. The reaction proceeds under mild conditions, tolerates a range of functionalities, and enables concomitant O- or N-silylation of acidic OH or NH groups. A Hammett ρ value of +1.4 ± 0.1 obtained for