An Enyne Cope Rearrangement Enables Polycycloalkane Synthesis from Readily Available Starting Materials
作者:Sarah K. Scott、Alexander J. Grenning
DOI:10.1002/anie.201703186
日期:2017.7.3
Knoevenagel adducts (cyclohexylidenemalononitriles) and two different propargyl electrophiles serve as carbon sources for assembling diverse 6/7/5 tricycloalkanes, a common terpenoid framework. The sequence involves three unique reactions: 1) deconjugative propargylation, 2) one‐pot enyne Cope rearrangement/deconjugative propargylation, and 3) an allenic Pauson–Khand reaction.
Methods and compositions for terpenoid tricycloalkane synthesis
申请人:University of Florida Research Foundation, Inc.
公开号:US10287239B1
公开(公告)日:2019-05-14
In one aspect, the disclosure relates to methods for preparation of intermediates useful for the preparation of terpenoid cores. In a further aspect, the disclosed methods pertain to the preparation of compounds comprising a terpenoid core or scaffold, such as 6/7/5 tricycloalkanes. The disclosed methods utilize abundant starting materials and simple reaction sequences that can be used to tunably and scalably assemble common terpenoid cores. In various aspects, the present disclosure pertains to compounds prepared using the disclosed methods. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.
Selective ring-rearrangement or ring-closing metathesis of bicyclo[3.2.1]octenes
作者:Evgeniya Semenova、Ouidad Lahtigui、Sarah K. Scott、Matthew Albritton、Khalil A. Abboud、Ion Ghiviriga、Adrian E. Roitberg、Alexander J. Grenning
DOI:10.1039/d0cc04624h
日期:——
Explored was the competitive ring-closingmetathesis vs. ring-rearrangement metathesis of bicyclo[3.2.1]octenes prepared by a simple and convergent synthesis from bicyclic alkylidenemalono-nitriles and allylic electrophiles. It was uncovered that ring-closingmetathesis occurs exclusively on the tetraene-variant, yielding unique, stereochemically and functionally rich polycyclic bridged frameworks
Facile Synthesis and Ring-Opening Cross Metathesis of Carbo- and Heterocyclic Bicyclo[3.2.1]oct-6-en-3-ones Using Gaseous Olefinic Reaction Partners
作者:Marko D. Mihovilovic、Birgit Grötzl、Wolfgang Kandioller、Radka Snajdrova、Adél Muskotál、Dario A. Bianchi、Peter Stanetty
DOI:10.1002/adsc.200505375
日期:2006.3
were prepared by a facile [4+3]-cycloaddition strategy involving sonochemistry. The oxyallyl species required for the reaction with the corresponding diene was generated from a suitable perbromo ketone with activated zinc under sonification conditions. The resulting dibromo bicyclo compounds were reduced to the target products using a Cu/Zn couple. Ring-openingcrossmetathesis of the resulting bicyclic