Combining the Petasis 3-Component Reaction with Multiple Modes of Cyclization: A Build/Couple/Pair Strategy for the Synthesis of Densely Functionalized Small Molecules
作者:Thomas Flagstad、Mette R. Hansen、Sebastian T. Le Quement、Michael Givskov、Thomas E. Nielsen
DOI:10.1021/co500091f
日期:2015.1.12
strategy for the synthesis of complex and densely functionalized smallmolecules is presented. The strategy relies on synthetically tractable building blocks (build), that is, diversely substituted hydrazides, α-hydroxy aldehydes, and boronic acids, which undergo Petasis 3-component reactions (couple) to afford densely functionalized anti-hydrazido alcohols. The resulting scaffolds can subsequently
Synthesis of Heterocycles through a Ruthenium-Catalyzed Tandem Ring-Closing Metathesis/Isomerization/N-Acyliminium Cyclization Sequence
作者:Erhad Ascic、Jakob F. Jensen、Thomas E. Nielsen
DOI:10.1002/anie.201100417
日期:2011.5.23
Tandem bicycle: In the title reaction double bonds created during ring‐closingmetathesis isomerize to generate reactive iminium intermediates that undergo intramolecular cyclization reactions with tethered heteroatom and carbon nucleophiles. In this way, a series of biologically interesting heterocyclic compounds can be made, including a known precursor for the total synthesis of the antiparasitic
Generation of a Heteropolycyclic and sp<sup>3</sup>
-Rich Scaffold for Library Synthesis from a Highly Diastereoselective Petasis/Diels-Alder and ROM-RCM Reaction Sequence
作者:Thomas Flagstad、Carlos M. G. Azevedo、Nikolaj S. Troelsen、Geanna K. Min、Yohan Macé、Anthony Willaume、Rachel Guilleux、Mélanie Velay、Karine Bonnet、Remy Morgentin、Thomas E. Nielsen、Mads H. Clausen
DOI:10.1002/ejoc.201801551
日期:2019.2.7
present an efficient, rapid route to three structurally distinct classes of compounds (A–C) from a single precursor, which in turn is available through a one-pot Petasis 3-component-reaction–Diels-Alder cascade reaction. We demonstrate the versatility of the approach through the synthesis of 35 exemplary compounds from the three classes, as well as by the production of 2188 final compounds, which have been