Sequential Intramolecular Cyclobutadiene Cycloaddition, Ring-Opening Metathesis, and Cope Rearrangement: Total Syntheses of (+)- and (−)-Asteriscanolide
作者:John Limanto、Marc L. Snapper
DOI:10.1021/ja001946b
日期:2000.8.23
The value of new transformations can become apparent when brought to bear in complex molecule synthesis. To demonstrate the utility of intramolecular cyclobutadiene cycloadditions 1 and ring-opening metatheses, 2 we report herein the first application of these complementary transformations in the total syntheses of (+)and (-)-asteriscanolide ( 1). The incorporation of these reactions into the synthesis
Wolff/Cope Approach to the AB Ring of the Sesterterpenoid Variecolin
作者:Michael R. Krout、Christopher E. Henry、Thomas Jensen、Kun-Liang Wu、Scott C. Virgil、Brian M. Stoltz
DOI:10.1021/acs.joc.7b02972
日期:2018.7.6
A stereoselectivesynthesis of the AB ring of the complex sesterterpenoid variecolin is presented. Our strategy features the development of a tandem Wolff/Cope rearrangement of α-diazo cyclobutyl ketones for the construction of fused, 8-membered carbocycles. Preliminary studies revealed a facile Wolff rearrangement but a difficult vinyl ketene cyclobutane Cope rearrangement. We have leveraged an efficient
New cycloaddition/fragmentation strategies for preparing 5-7-5 and 5-7-6 fused tricyclic ring systems
作者:Jing He、Marc L. Snapper
DOI:10.1016/j.tet.2013.05.129
日期:2013.9
Tethering additional functionality to cyclobutadienyl iron tricarbonyl complexes provides new opportunities for the rapid construction of medium-ring-containing polycyclic compounds. Specifically, an intramolecular cycloaddition between cyclobutadiene and a tethered olefin, followed by an intramolecular cyclopropanation of the resulting cyclobutene-containing adduct generates highly strained pentacyclic intermediates. These compounds can then be relaxed thermally to generate 5-7-5 and 5-7-6 fused tricyclic ring systems that are shared with numerous natural products. (C) 2013 Elsevier Ltd. All rights reserved.
Intramolecular Cyclobutadiene Cycloaddition/Cyclopropanation/Thermal Rearrangement: An Effective Strategy for the Asymmetric Syntheses of Pleocarpenene and Pleocarpenone
作者:Michael J. Williams、Holly L. Deak、Marc L. Snapper
DOI:10.1021/ja0674340
日期:2007.1.1
The first total synthesis of the guaiane sesquiterpene natural products pleocarpenone and pleocarpenene is described. An intramolecularcycloaddition of cyclobutadiene, followed by cyclopropanation...
Development and Evaluation of a Solid-Supported Cyclobutadieneiron Tricarbonyl Complex for Parallel Synthesis Applications
作者:Jason J. Marineau、Marc L. Snapper
DOI:10.1021/co2002069
日期:2012.6.11
syntheses of these novel systems could be facilitated with the introduction of an immobilized cyclobutadiene reagent. Reported herein are preliminary studies of an iron tricarbonyl cyclobutadiene complex attached to solid support. Oxidative unmasking of the immobilized cyclobutadiene in the presence of various dienophiles is shown to produce a small collection of substituted bicyclo[2.2.0]hexene derivatives