功能化的氮杂环丁烷、2,3-二氢呋喃或非正统的二氧杂环己烷-3-氮杂双环酮-4-烯基序是N-环氧乙烷基甲基苯磺酰胺和 β-氯-肉桂醛之间的无过渡金属反应的产物,具体取决于是否使用 NaI /K 2 CO 3或 LiBr/K 2 CO 3。这些扩环反应涉及衍生自N-环氧乙烷基甲基苯磺酰胺和 β-氯肉桂醛作为中间体的烯酰胺(X 射线证据) 。N-环氧乙烷基甲基苯磺酰胺本身在加热时产生易于分离的结晶异构重氮杂环烷,其可通过X-射线晶体学表征。
功能化的氮杂环丁烷、2,3-二氢呋喃或非正统的二氧杂环己烷-3-氮杂双环酮-4-烯基序是N-环氧乙烷基甲基苯磺酰胺和 β-氯-肉桂醛之间的无过渡金属反应的产物,具体取决于是否使用 NaI /K 2 CO 3或 LiBr/K 2 CO 3。这些扩环反应涉及衍生自N-环氧乙烷基甲基苯磺酰胺和 β-氯肉桂醛作为中间体的烯酰胺(X 射线证据) 。N-环氧乙烷基甲基苯磺酰胺本身在加热时产生易于分离的结晶异构重氮杂环烷,其可通过X-射线晶体学表征。
Hf(IV)-Catalyzed Enantioselective Epoxidation of <i>N</i>-Alkenyl Sulfonamides and <i>N</i>-Tosyl Imines
作者:José Luis Olivares-Romero、Zhi Li、Hisashi Yamamoto
DOI:10.1021/ja211880s
日期:2012.3.28
Asymmetric epoxidation of allylic and homoallylic amine derivatives catalyzed by Hf(IV)-bishydroxamic acid complexes is described. Under similar conditions, aldimine and ketimine produced oxaziridines. The sulfonyl group is demonstrated to be an effective directing group for these transformations.
Gadolinium-Catalyzed Regio- and Enantioselective Aminolysis of Aromatic<i>trans</i>-2,3-Epoxy Sulfonamides
作者:Chuan Wang、Hisashi Yamamoto
DOI:10.1002/anie.201503391
日期:2015.7.20
The first enantioselectiveaminolysis of aromatic trans‐2,3‐epoxy sulfonamides has been accomplished, which was efficiently catalyzed by a Gd‐N,N′‐dioxide complex. Under the directing effect of the sulfonamide moiety the ring‐opening reaction proceeded selectively at the C‐3 position in a highly enantioselective manner furnishing various Ts‐ and SES‐protected 3‐amino‐3‐phenylpropan‐2‐olamines as products
Ring expansion/opening reactions of epoxy ene-amides: access to azabicyclononene, tetrahydropyridine and tetrazole scaffolds
作者:Suraj、K. C. Kumara Swamy
DOI:10.1039/d3nj00529a
日期:——
obtained from epoxy (terminal as well as internal) benzenesulfonamide and substituted chloro-acrylaldehydes, undergo Lewis acid (BF3·OEt2) catalysed cyclisation to afford azabicyclononene, tetrahydropyridinyl benzoate or tetrahydropyridine-carbaldehyde scaffolds depending on the substrate. In the presence of Me3SiN3, substituted tetrazoles are readily obtained. Key products have been characterized by
由环氧(末端和内部)苯磺酰胺和取代的氯丙烯醛获得的烯磺酰胺经过路易斯酸 (BF 3 ·OEt 2 ) 催化环化,根据底物提供氮杂双环酮、苯甲酸四氢吡啶酯或四氢吡啶甲醛支架。在Me 3 SiN 3存在下,很容易得到取代的四唑。主要产品已通过单晶 X 射线晶体学进行表征。