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Sietmann, Jan; Wiest, Johannes M.
doi: 10.1002/anie.201910767pmid: 31550067
Cyclobutanones hold a privileged role in enantioselective desymmetrization because their inherent ring strain allows for a variety of unusual reactions to occur. Current strategies include α‐functionalization, rearrangement, and C−C bond activation to directly convert cyclobutanones into a wide range of enantiomerically enriched compounds, including many biologically significant scaffolds. This Minireview provides an overview of state‐of‐the‐art methods that generate complexity from prochiral cyclobutanones in a single operation.
Fäseke, Vincent C.; Raps, Felix C.; Sparr, Christof
doi: 10.1002/anie.201911255pmid: 31793145
The folding and cyclization of poly‐β‐carbonyl chains controlled by the intricate enzymatic polyketide synthase machinery results in a remarkable diversity of aromatic natural products. Synthetic methods that allow for the preparation of highly reactive polyketide chains while governing their folding in ensuing cyclizations likewise lead to versatile divergent preparations of aromatic scaffolds valuable for numerous applications. Although biomimetic polyketide cyclizations have repeatedly been applied in the total synthesis of polyphenol natural products, their utility for the preparation of the broad range of polyaromatic architectures has yet to reach its full potential. This Minireview highlights some of the virtues of applying polyketide logic to the retrosynthetic analysis of polycyclic aromatic scaffolds, the increasing accessibility of precursors, and the potential of small‐molecule catalysts for controlling polyketide cyclizations to provide polyaromatic scaffolds.
Shi, Xiaoyang; Xiao, Hang; Azarabadi, Habib; Song, Juzheng; Wu, Xiaolong; Chen, Xi; Lackner, Klaus S.
doi: 10.1002/anie.201906756pmid: 31379037
The urgency to address global climate change induced by greenhouse gas emissions is increasing. In particular, the rise in atmospheric CO2 levels is generating alarm. Technologies to remove CO2 from ambient air, or “direct air capture” (DAC), have recently demonstrated that they can contribute to “negative carbon emission.” Recent advances in surface chemistry and material synthesis have resulted in new generations of CO2 sorbents, which may drive the future of DAC and its large‐scale deployment. This Review describes major types of sorbents designed to capture CO2 from ambient air and they are categorized by the sorption mechanism: physisorption, chemisorption, and moisture‐swing sorption.
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