Organocatalytic asymmetric intramolecular [3+2] cycloaddition: A straightforward approach to access multiply substituted hexahydrochromeno[4,3-b]pyrrolidine derivatives in high optical purity
Intramolecular Tandem Seleno-Michael/Aldol Reaction: A Simple Route to Hydroxy Cyclo-1-ene-1-carboxylate Esters
作者:Piotr Banachowicz、Jacek Mlynarski、Szymon Buda
DOI:10.1021/acs.joc.8b01853
日期:2018.9.21
Intramolecular tandem seleno-Michael/aldol reaction followed by an oxidation–elimination process can be an efficient tool for the construction of hydroxy cyclo-1-ene-1-carboxylate esters from oxo-α,β-unsaturated esters. Generation of lithium selenolate from elemental selenium and n-BuLi provides a simple and efficient one-pot access to cyclic endo-Morita–Baylis–Hillman adducts.
Scope of the Asymmetric Intramolecular Stetter Reaction Catalyzed by Chiral Nucleophilic Triazolinylidene Carbenes
作者:Javier Read de Alaniz、Mark S. Kerr、Jennifer L. Moore、Tomislav Rovis
DOI:10.1021/jo702313f
日期:2008.3.1
A highly enantioselective intramolecular Stetter reaction of aromatic and aliphatic aldehydes tethered to different Michael acceptors has been developed. Two triazolium scaffolds have been identified that catalyze the intramolecular Stetter reaction with good reactivity and enantioselectivity. The substrate scope has been examined and found to be broad; both electron-rich and -poor aromatic aldehydes
Synthesis of Fluorous and Nonfluorous Polycyclic Systems by One-Pot, Double Intramolecular 1,3-Dipolar Cycloaddition of Azomethine Ylides
作者:Wei Zhang、Yimin Lu、Steven Geib
DOI:10.1021/ol0507773
日期:2005.5.1
[reaction: see text]. Under microwave irradiation, a one-pot, double intramolecular [3 + 2]-cycloaddition reaction of azomethineylides leads to formation of a novel hexacyclic ringsystem. The major diastereomer is isolated, and its stereochemistry is determined by X-ray crystal structure analysis.
Constrained TRPV1 agonists synthesized via silver-mediated intramolecular azo-methine ylide cycloaddition of α-iminoamides
作者:Thomas O. Painter、Krisztian Kaszas、Jacklyn Gross、Justin T. Douglas、Victor W. Day、Michael J. Iadarola、Conrad Santini
DOI:10.1016/j.bmcl.2013.12.061
日期:2014.2
As part of an effort to identify agonists of TRPV1, a peripheral sensory nerve ion channel, high throughput screening of the NIH Small Molecule Repository (SMR) collection identified MLS002174161, a pentacyclic benzodiazepine. A synthesis effort was initiated that ultimately afforded racemic seco analogs 12 of the SMR compound via a silver mediated intramolecular [3+2] cycloaddition of an azo-methine ylide generated from alpha-iminoamides 11. The cycloaddition set four contiguous stereocenters and, in some cases, also spontaneously afforded imides 13 from 12. The synthesis of compounds 12, the features that facilitated the conversion of 12-13, and their partial agonist activity against TRPV1 are discussed. (C) 2013 Elsevier Ltd. All rights reserved.