allows regio- and stereocontrolled access to a variety of functionalised and substituted seven-membered rings. The substitution array can be diastereoselectively modulated by appropriate choice of the reaction partners, and the reaction allows the control of up to five newly created stereocentres and a complete chiral induction in the case of an opticallyactive ketone precursor. The high level of
A Practical Method for the Synthesis of 2-Alkynylpropenals
作者:Charnsak Thongsornkleeb、Rick L. Danheiser
DOI:10.1021/jo047869a
日期:2005.3.1
A general method for the preparation of 2-alkynyl acroleins is described beginning with vinyl iodide 5 and involving a combination of Sonogashira coupling and Dess-Martin oxidation. Critical to the success of this approach is the use of a special workup procedure for the oxidation step. The resultant enynals participate in a variety of addition reactions including aldol condensations and reactions with organolithium compounds.
The MARDi Cascade: A New Base-Induced Five-Step Anionic Domino Reaction for the Stereoselective Preparation of Functionalized Cycloheptenes
作者:Marie-Hélène Filippini、Jean Rodriguez
DOI:10.1021/jo970196u
日期:1997.5.1
Creating Quaternary Centers with High Exo Stereoselectivity Using Activated α-Alkynyl Dienophiles
作者:Sun-Joon Min、Gavin O. Jones、K. N. Houk、Samuel J. Danishefsky
DOI:10.1021/ja073528d
日期:2007.8.1
Ethynyl substituents were used to direct a highly exoselective creation of quaternary carbon centers in Diels-Alder cycloaddition reactions involving activated alpha-alkynyl dienophiles. The origins of electronic activation and the high stereoselectivities of these reactions were investigated by the B3LYP density functional method.