Iridium-Catalyzed Dynamic Kinetic Isomerization: Expedient Synthesis of Carbohydrates from Achmatowicz Rearrangement Products
作者:Hao-Yuan Wang、Ka Yang、Scott R. Bennett、Sheng-rong Guo、Weiping Tang
DOI:10.1002/anie.201503151
日期:2015.7.20
A highly stereoselective dynamickineticisomerization of Achmatowiczrearrangementproducts was discovered. This new internal redox isomerization provided ready access to key intermediates for the enantio‐ and diastereoselective synthesis of a series of naturally occurring sugars. The nature of the de novo synthesis also enables the preparation of both enantiomers.
Lipase B from Candida antarctica catalyzes the oxidative ring expansion of furfuryl alcohols using aqueous hydrogen peroxide to yield functionalized pyranones under mild conditions. The method further allows for the preparation of corresponding piperidinone derivatives by enzymatic rearrangement of N-protected furfurylamines.
来自南极念珠菌的脂肪酶 B 使用过氧化氢水溶液催化糠醇的氧化扩环,在温和条件下产生官能化的吡喃酮。该方法还允许通过N-保护的糠胺的酶促重排来制备相应的哌啶酮衍生物。
作者:Daniel Thiel、Fabian Blume、Christina Jäger、Jan Deska
DOI:10.1002/ejoc.201800333
日期:2018.6.7
HUOM! TAMA MANUSKA ON TILASSA CLOSED KUNNES ARTIKKELI ON JULKAISTU JA JULKAISUVIIVE MAARITELTY KUSTANTAJAN JULKAISUPAIVASTA ALKAEN. The manuscript is "closed" until the article has been published and the embargo date can be defined.
呼!蒂拉萨岛上的 TAMA MANUSKA 关闭了 JULKAISTU JA JULKAISUVIIVE MAARITELTY KUSTANTAJAN JULKAISUPAIVASTA ALKAEN 的 KUNNES ARTIKKELI。在文章发表并且可以确定禁运日期之前,手稿处于“关闭”状态。
Palladium‐Catalyzed Regioselective and Diastereoselective
<i>C</i>
‐Glycosylation by Allyl‐Allyl Coupling
作者:Junhao Li、Nan Zheng、Xuelun Duan、Rui Li、Wangze Song
DOI:10.1002/adsc.202001136
日期:2021.2.2
A Pd‐catalyzed C‐glycosylation reaction was developed by allyl‐allyl coupling process using Achmatowicz rearrangement products as donors and methylcoumarins as acceptors under mild conditions. This method featured regio‐ and diastereoselectivities, stereodivergent synthesis of C‐glycosides. The glycosyl donors with controlled stereodiversity and glycosyl acceptors with fluorescent performace further
Structure–Odor Correlations in Homologous Series of Mercapto Furans and Mercapto Thiophenes Synthesized by Changing the Structural Motifs of the Key Coffee Odorant Furan-2-ylmethanethiol
作者:Sebastian Schoenauer、Peter Schieberle
DOI:10.1021/acs.jafc.8b00857
日期:2018.4.25
seeds. Its unique coffee-like odor quality elicited at very low concentrations, and the fact that only a very few compounds showing a similar structure have previously been described in foods make 1 a suitable candidate for structure–odor activity studies. To gain insight into the structural features needed to evoke a coffee-like odor at low concentrations, 46 heterocyclic mercaptans and thio ethers