Synthesis of Optically Active Heterocyclic Compounds by Preparation of 1,3-Dinitro Derivatives and Enzymatic Enantioselective Desymmetrization of Prochiral Diamines
efficient chemical preparation of novel optically active 2-substituted propane-1,3-diamines is described. Diamines have been obtained from the corresponding commercially available aldehydes in a straightforward two-step synthesis via the corresponding 1,3-dinitro compounds, which were hydrogenated under mild reaction conditions by using platinum dioxide as the catalyst. Subsequent enzymatic enantioselective
yl)‐propanen 3. ‐ Umsetzungen der Aldehyde 4 bzw. 10 mit den Benzylaminen 12 sowie der Indolylalkylamine 6a bzw. 9a mit den Benzaldehyden 11 und Reduktionen der Schiffbasen führen zu N‐Benzyl‐(indol‐3‐ylmethyl)‐aminen 13 undN‐Benzyl‐(indol‐3‐ylethyl)‐aminen 14. ‐ Die tert Amine 16 werden über die Formamide 15, Amine 18 nach Mannich synthetisiert. ‐ Alle Verbindungen werden auf wachstumshemmende Wirkung
Enantioselective desymmetrization of prochiral 1,3-dinitropropanes via organocatalytic allylic alkylation
作者:Soumya Jyoti Singha Roy、Santanu Mukherjee
DOI:10.1039/c3cc47645f
日期:——
An enantioselective desymmetrization of prochiral 1,3-dinitropropanes has been developed which proceeds via enantiogroup differentiating organocatalyticallylicalkylation. Densely functionalized products with two vicinal stereocenters were obtained generally with good to excellent diastereoselectivity (up to >20 : 1 dr) and superb enantioselectivity (up to >99 : 1 er).
Synthesis of Nitroalkenes Involving a Cooperative Catalytic Action of Iron(III) and Piperidine: A One-Pot Synthetic Strategy to 3-Alkylindoles, 2<i>H</i>-Chromenes and<i>N</i>-Arylpyrrole
作者:Swapnadeep Jalal、Soumen Sarkar、Krishnendu Bera、Sukhendu Maiti、Umasish Jana
DOI:10.1002/ejoc.201300172
日期:2013.8
efficient and simple strategy has been developed to synthesize various substituted nitroalkenesinvolving a cooperativecatalytic system of FeCl3 and piperidine. This dual catalytic protocol simultaneously activates both electrophile and nucleophile and works under mild reaction conditions so that many sensitive functional groups were tolerated. Moreover, this cooperativecatalytic reaction is also suitable
Synthesis of benzo[a]carbazole derivatives from 3-ethylindoles by exploiting the dual character of benzoquinone as an oxidizing agent and dienophile
作者:Chun-Wei Kuo、Ashok Konala、Lyu Lin、Ting-Ta Chiang、Chia-Yu Huang、Tang-Hao Yang、Veerababurao Kavala、Ching-Fa Yao
DOI:10.1039/c6cc03124b
日期:——
Dual character of benzoquinone is exploited for the synthesis of benzo[a]carbazolederivatives starting from 3-ethylindole derivative. The diene was generated in situ from 3-ethylindole derivative with the help of benzoquinone...