Nazarov Reactions Intercepted by (4 + 3) Cycloadditions with Oxygen-Substituted Dienes
作者:François M. LeFort、Vinayak Mishra、Graham D. Dexter、Timothy D. R. Morgan、D. Jean Burnell
DOI:10.1021/acs.joc.5b00914
日期:2015.6.5
The oxyallyl cation intermediate from the Lewisacidmediated Nazarov reaction of an allenyl vinyl ketone was intercepted by acyclic, 2-silyloxy-substituted butadienes by highly regioselective (4 + 3) cycloadditions. Stereoselectivity was often modest, but in some instances steric interactions were responsible for high selectivity. The results are consistent with concerted (4 + 3) cycloadditions. In
A Convergent Total Synthesis of the Telomerase Inhibitor (±)-γ-Rubromycin
作者:Michael Wilsdorf、Hans-Ulrich Reissig
DOI:10.1002/anie.201400315
日期:2014.4.22
The totalsynthesis of the human telomeraseinhibitor γ‐rubromycin in its racemic form was accomplished in 3.8 % overall yield. The key feature of this synthesis is an efficient acid‐catalyzed spiroketalization for the construction of the spiroketal core. The required electronically well‐balanced spiroketal precursor was obtained by the convergent assembly of a naphthyl‐substituted aldehyde, an α‐
Fettes, Kevin; McQuire, leslie; Murray, Alistar W., Journal of the Chemical Society. Perkin transactions I, 1995, # 17, p. 2123 - 2128
作者:Fettes, Kevin、McQuire, leslie、Murray, Alistar W.
DOI:——
日期:——
Synthesis of the hexacyclic triterpene core of the jujuboside saponins via tandem Wolff rearrangement–intramolecular ketene hetero-Diels–Alder reaction
作者:Rashad R. Karimov、Derek S. Tan、David Y. Gin
DOI:10.1016/j.tet.2018.04.051
日期:2018.6
The jujubosides are saponin natural products reported to have immunoadjuvant, anticancer, antibacterial, antifungal, and antisweet activities. The triterpene component, jujubogenin contains a unique tricyclic ketal motif comprising the DEF ring system. Herein, we describe our efforts toward the total synthesis of jujubogenin, using a sterically-demanding intermolecular Diels-Alder reaction to assemble
Towards γ-Rubromycin: Model Studies, Development of a C<sub>3</sub>Building Block, and Synthesis of 4′-Silyl-γ-rubromycin
作者:Michael Wilsdorf、Hans-Ulrich Reissig
DOI:10.1002/ejoc.201601224
日期:2016.12
system. Herein, we report our strategy towards this class of natural products, that led to the identification of an electronically well-balanced spiroketalization precursor and eventually culminated in the preparation of an unnatural 4′-silyl-substituted γ-rubromycin derivative in racemic form. In the course of this study, we additionally introduced a new type of γ-silylated allylic phosphonate reagents