Versatile Strategy to Access Tricycles Related to Quassinoids and Triterpenes
摘要:
The reactivity of two new bicyclic cyclohexenones (13 and 27) with several Nazarov reagents is presented. A flexible synthetic strategy is developed and provides access to highly substituted tricycles related to quassinoids and triterpenes.
cis-4-Alkoxydialkyl- andcis-4-Alkoxydiarylprolinol Organocatalysts: High Throughput Experimentation (HTE)-Based and Design of Experiments (DoE)-Guided Development of a Highly Enantioselectiveaza-Michael Addition of Cyclic Imides to α,β-Unsaturated Aldehyd
作者:Ismael Arenas、Alessandro Ferrali、Carles Rodríguez-Escrich、Fernando Bravo、Miquel A. Pericàs
DOI:10.1002/adsc.201700120
日期:2017.7.17
catalysts for the enantioselectiveaddition of succinimide to α,β‐unsaturated aldehydes. Further optimization of the reaction conditions with design of experiments (DoE) techniques established the catalyst of choice for the considered aza‐Michael reaction, the corresponding adducts (12 examples) being obtained in good yields and excellent enantioselectivities (succinimide and maleimide donors). The synthetic
Design, Synthesis and Biological Evaluation of Highly Potent Simplified Archazolids
作者:Solenne Rivière、Christin Vielmuth、Christiane Ennenbach、Aliaa Abdelrahman、Carina Lemke、Michael Gütschow、Christa E. Müller、Dirk Menche
DOI:10.1002/cmdc.202000154
日期:2020.7.20
agents. Their complex macrolide structures and scarce natural supply make the development of more readily available analogues highly important. Herein, we report the design, synthesis and biological evaluation of four simplified and partially saturated archazolid derivatives. We also reveal important structure‐activity relationship data as well as insights into the pharmacophore of these complex polyketides
A stereoselectiveinverse-electron-demandaza-Diels–Alder cycloaddition process of cyclic 1-aza-1,3-butadienes and α,β-unsaturatedaldehydes has been developed via dienamine catalysis. This reaction exhibits excellent β,γ-regioselectivity for enal substrates with substantial structural diversity and broad functionalities, readily producing highly enantioenriched fused piperidine derivatives and enabling
Stereoselective synthesis of ε-lactones or spiro-heterocycles through NHC-catalyzed annulation: divergent reactivity by catalyst control
作者:Min Wang、Zi-Qiang Rong、Yu Zhao
DOI:10.1039/c4cc07788a
日期:——
NHC-catalyzed divergent annulation of enals with heterocyclic enones was developed to produce benzofuran/indole-containing ε-lactones or spiro-heterocycles in a highly diastereo- and enantioselective fashion.
Enantioselective Cascade Annulation of α‐Amino‐ynones and Enals Enabled by Gold and Oxidative NHC Relay Catalysis
作者:Jianfeng Jiang、Xia Wang、Shengping Liu、Sichen Zhang、Binmiao Yang、Yu Zhao、Shenci Lu
DOI:10.1002/anie.202115464
日期:2022.3.21
An unprecedented system of gold and oxidativeNHC relay catalysis was developed, which enables highly enantioselective cascade annulation between readily available α-amino-ynones with enals to afford pyrrole-fused lactones in high yield and excellent level of enantioselectivity. The lactone products could be readily converted to diverse densely functionalized pyrroles and pyrrolin-4-ones in high yields