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。
Intermolecular Regio‐ and Stereoselective Hetero‐[5+2] Cycloaddition of Oxidopyrylium Ylides and Cyclic Imines
作者:Changgui Zhao、Daniel A. Glazier、Daoshan Yang、Dan Yin、IIia A. Guzei、Michael M. Aristov、Peng Liu、Weiping Tang
DOI:10.1002/anie.201811896
日期:2019.1.14
We have developed the first intermolecular hetero‐[5+2] cycloaddition reaction between oxidopyrylium ylides and cyclic imines with excellent control of regio‐ and stereoselectivity. Surprisingly, divergent stereochemistry was observed depending on the substitution pattern of the oxidopyrylium ylide. This new reaction provides quick access to highly substituted nitrogen‐containing seven‐membered rings—azepanes