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.
Tetracycline analogues with a selective inhibitory effect on HIF-1α
作者:Y. Bendiabdellah、K. M. Rahman、B. Uranchimeg、K. S. Nahar、D. Antonow、R. H. Shoemaker、G. Melillo、G. Zinzalla、D. E. Thurston
DOI:10.1039/c4md00111g
日期:——
As part of a programme to discover novel transcription factor inhibitors, a 40-membered library of tetracycline analogues was screened to identify potential HIF-1 inhibitors. Two novel analogues (5b and 5c) with significant HIF-1 modulation properties were identified. These molecules possess good cellular penetration properties, and provide significant down-regulation of VEGF in U251 cells.
Diene-Transmissive Diels–Alder Sequences with Benzynes
作者:Josemon George、Jas S. Ward、Michael S. Sherburn
DOI:10.1021/acs.orglett.9b02807
日期:2019.9.20
Diene-transmissive Diels–Alder (DTDA) sequences are extraordinarily powerful processes for the generation of fused bicyclic systems. Nonetheless, only stable dienophiles have previously been deployed. Herein we report DTDA sequences with a variety of substituted [3]dendralenes in the first study to deploy arynes as dienophiles. We demonstrate the one-flask generation of complex, aromatic-ring-containing