AbstractAn eco-friendly and efficient synthesis of nitrones is presented by condensation of an equimolar amount of aldehydes and N-substituted hydroxylamine hydrochlorides in glycerol as a recyclable solvent-catalyst. This novel protocol provides rapid and mild access to a series of nitrone derivatives in good to excellent yields in the absence of catalyst and base. Graphic abstractSYNOPSIS In this
Lewis base-catalyzed diastereoselective [3 + 2] cycloaddition reaction of nitrones with electron-deficient alkenes: an access to isoxazolidine derivatives
A Lewis base-catalyzed [3 + 2] cycloadditionreaction of nitrones with electron-deficientalkenes has been achieved under mild reaction conditions, affording various functionalized isoxazolidine derivatives as single diastereomers in moderate to excellent yields.
One-Pot Synthesis of Benzo[<i>c</i>]phenanthridine Alkaloids from 7-Azabenzonorbornadienes and Aryl Nitrones
作者:Narasingan Aravindan、Masilamani Jeganmohan
DOI:10.1021/acs.orglett.3c01192
日期:2023.6.2
An efficient synthesis of benzo[c]phenanthridine alkaloids via a synergistic combination of C–C bond formation and a cycloaromatization reaction is described. Aryl nitrones react with 7-azabenzonorbornadienes in the presence of a Rh(III) catalyst, providing pharmaceutically useful benzo[c]phenanthridine derivatives in good to moderate yields. Using this methodology, highly useful alkaloids such as
描述了通过 C-C 键形成和环芳构化反应的协同组合有效合成苯并 [ c ] 菲啶生物碱。在 Rh(III) 催化剂存在下,芳基硝酮与 7-氮杂苯并降冰片二烯反应,以良好至中等收率提供药学上有用的苯并 [ c ] 菲啶衍生物。使用这种方法,可以在一个步骤中制备非常有用的生物碱,例如诺法加龙宁、去甲白屈菜红碱、地卡林、去甲血根碱和去甲尼替丁。