Cascade reaction of isatins with nitro-substituted enamines: highly selective synthesis of functionalized (Z)-3-(1-(arylamino)-2-oxoarylidene)indolin-2-ones
Perrot; Berger, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1952, vol. 235, p. 185
作者:Perrot、Berger
DOI:——
日期:——
Nucleophilic attacks on carbon–carbon double bonds. Part XXI. Substitution of (E)-α-chloro-β-nitrostyrene by anilines in acetonitrile
作者:Zvi Rappoport、Shmaryahu Hoz
DOI:10.1039/p29750000272
日期:——
into the product (VII). A multi-step mechanism, in which the nucleophilicattack step (k1) to form the zwitterion (I) is followed by its reversal (k–1) or by expulsion of chloride ion from (I)(k2), with kobs=k1k2/k–1, is suggested. The absence of catalysis in the reactions of (VI) and the activating effect of the nitro-group in nucleophilic vinylic substitution are discussed.
(E)-α-氯-β-硝基苯乙烯(VI)的氯代取代物被乙腈中的取代苯胺取代,得到相应的硝基烯胺(VII),在胺中是一阶的,得到ΔH = 3·7–5·7 kcal mol –1,ΔS = –50至–58 cal mol –1 K –1,哈米特ρ值为3。用氘置换(VI)的乙烯基氢原子会导致同位素效应约 1带有几个苯胺,并且苯胺与(VI)在MeCN–D 2 O中反应时,氘没有掺入产物(VII)中。多步机制,其中亲核攻击步骤(k 1)形成两性离子(I),然后将其反转(k –1)或从(I)(k 2)排出氯离子,其中k obs = k 1 k 2 / k –1。讨论了(VI)反应中不存在催化作用以及硝基基团在亲核乙烯基取代中的活化作用。
Cascade reaction of isatins with nitro-substituted enamines: highly selective synthesis of functionalized (<i>Z</i>)-3-(1-(arylamino)-2-oxoarylidene)indolin-2-ones
作者:Cong-Hai Zhang、Rong Huang、Xia Qing、Jun Lin、Sheng-Jiao Yan
DOI:10.1039/d0cc00923g
日期:——
A novel protocol for the construction of functionalized (Z)-3-(1(-arylamino)-2-oxoarylidene)indolin-2-ones (AOIDOs) from isatins 1 with nitro-substituted enamines 2via an unprecedented cascade reaction catalyzed by sulfamic acid is developed.