The first general synthetic approach to substituted [3]- and higher dendralenes is reported. Fifty-one mono- through to penta-substituted dendralenes carrying alkyl-, cycloalkyl-, alkenyl-, alkynyl-, aryl- and heteroaryl-substitutents are accessed, and the first (E)/(Z)-stereoselective syntheses of dendralenes are reported (twenty-eight examples). The approach involves twofold Pd(0)-catalyzed Negishi
Diene-Transmissive Enantioselective Diels–Alder Reactions and Sequences Involving Substituted Dendralenes
作者:Josemon George、Michael S. Sherburn
DOI:10.1021/acs.joc.9b02296
日期:2019.11.15
regio-, diastereo-, and enantioselective organocatalyzed Diels-Alder reactions with acrolein to form enantiomerically enriched cycloadducts. These monocycloadducts carry semicyclic dienes that undergo a second, substrate-controlled diastereoselective Diels-Alder reaction with a different dienophile to form 2-fold cycloadducts. Overall, annulated, functional group rich, chiral Δ1(9)-octalin building
Enantioselective oxa‐Diels–Alder Sequences of Dendralenes
作者:Yi‐Min Fan、Li‐Juan Yu、Michael G. Gardiner、Michelle L. Coote、Michael S. Sherburn
DOI:10.1002/anie.202204872
日期:2022.9.26
A highly enantioselective synthesis of target-relevant oxabicyclic systems is reported. The synthesis involves a sequence of two formal oxa-Diels–Alder reactions between a wide variety of achiral dendralenes and a carbonyl dienophile, proceeding with the generation of two new rings, four new covalent bonds and up to four new stereocenters.