Intramolecular Diels−Alder Reactions of Ester-Linked 1,3,8-Nonatrienes
摘要:
Penta-1,3-dienyl acrylates undergo kinetically controlled intramolecular Diels-Alder (lMDA) reactions and DFT calculations (B3LYP/6-31+G(d)) predict stereoselectivities that are in very good agreement with the experimental values. The nature of the diene Cl substituent has virtually no influence upon reactivity or trans/cis-stereoselectivity whereas terminal C9 dienophile substituents have a substantial effect on both the reactivity and stereoselectivity of these IMDA reactions. The TSs highlight contributions from strain in the developing tether-containing ring, and steric and electronic effects between tether and dienophile substituents, thus providing insight into the origins of IMDA reactivity and stereoselectivity.
Intramolecular Diels−Alder Reactions of Ester-Linked 1,3,8-Nonatrienes
作者:Tory N. Cayzer、Michael N. Paddon-Row、Damian Moran、Alan D. Payne、Michael S. Sherburn、Peter Turner
DOI:10.1021/jo0505829
日期:2005.7.1
Penta-1,3-dienyl acrylates undergo kinetically controlled intramolecular Diels-Alder (lMDA) reactions and DFT calculations (B3LYP/6-31+G(d)) predict stereoselectivities that are in very good agreement with the experimental values. The nature of the diene Cl substituent has virtually no influence upon reactivity or trans/cis-stereoselectivity whereas terminal C9 dienophile substituents have a substantial effect on both the reactivity and stereoselectivity of these IMDA reactions. The TSs highlight contributions from strain in the developing tether-containing ring, and steric and electronic effects between tether and dienophile substituents, thus providing insight into the origins of IMDA reactivity and stereoselectivity.
On the Diels–Alder reactions of pentadienyl maleates and citraconates
作者:Tory N. Cayzer、Michael J. Lilly、Rachel M. Williamson、Michael N. Paddon-Row、Michael S. Sherburn
DOI:10.1039/b501446h
日期:——
Reactions between conjugated dienols and maleic anhydride provide either cis-fused or trans-fused bicyclic products as major products, depending upon how the reaction is carried out. Simply mixing the two reactants together generally leads to cis-fused lactone acids in thermal reactions which proceed viaintermolecular Diels-Alderreaction followed by intramolecular esterification. Pre-forming the maleate