Forging C–C Bonds with Hindered Nucleophiles and Carbonyl Electrophiles: Reactivity and Selectivity of Allylic Tin Reagents/<i>n</i>-BuLi
作者:Morgan Cormier、Maha Ahmad、Jacques Maddaluno、Michaël De Paolis
DOI:10.1021/acs.organomet.7b00765
日期:2017.12.26
tertiary alcohols that are vicinal to quaternary carbons. With α,α′-dimethoxy-γ-pyrone, on the other hand, the grafting of a dienyl side chain was effected to prepare dienyl α′-methoxy-γ-pyrone in a stereo- and regioselective and convergent manner. Furthermore, the advantages of this route were highlighted for the preparation of organolithium species at low temperature with the formation of a minimum
Flexible Total Synthesis of (±)-Aureothin, a Potent Antiproliferative Agent
作者:Matthias Henrot、Alexandre Jean、Philippe A. Peixoto、Jacques Maddaluno、Michaël De Paolis
DOI:10.1021/acs.joc.6b00878
日期:2016.6.17
Amenable to late-stage preparation of analogues, a flexible and convergent total synthesis of (±)-aureothin is presented. The strategy was based on a desymmetrization of α,α′-dimethoxy-γ-pyrone by a process combining 1,4-addition and alkylation of vinylogous enolate to stereoselectively reach the backbone of the target. Palladium-catalyzed cyanation of an elaborated and isomerizable E,Z dienyl motif
Convergent Asymmetric Synthesis of (+)-Aureothin Employing an Oxygenase-Mediated Resolution Step
作者:Matthias Henrot、Martin E. A. Richter、Jacques Maddaluno、Christian Hertweck、Michaël De Paolis
DOI:10.1002/anie.201204259
日期:2012.9.17
Need an enzymatic push? The desymmetrization of α,α′‐dimethoxy‐γ‐pyrone allows the convergent and rapid preparation of the complete carbon skeleton of (+)‐aureothin (see scheme). The final step in the synthesis of the target molecule is the regiodivergent parallel kinetic resolution promoted by cytochrome P450 monooxygenase AurH to deliver the enantiopure natural product.
A Novel Oxidative Rearrangement of 6-Methoxypyran-2-ones
作者:Serena J. Eade、Robert M. Adlington、Andrew R. Cowley、Magnus W. Walter、Jack E. Baldwin
DOI:10.1021/ol0513490
日期:2005.8.1
As part of our continuing studies of pyrone-containing natural products, a series 6-methoxypyran-2-ones were synthesized. These were found to react with molecular oxygen at 20 degrees C, and this novel reaction yielded a series of highly functionalized alpha,beta-butenolides. [reaction: see text]