Reductive Coupling of Acrylates with Ketones and Ketimines by a Nickel-Catalyzed Transfer-Hydrogenative Strategy
作者:Craig S. Buxton、David C. Blakemore、John F. Bower
DOI:10.1002/anie.201707531
日期:2017.10.23
next cycle where it serves as the reductant for C-C bond formation. This strategy represents a conceptually unique approach to transfer-hydrogenative C-C bond formation, thus providing examples of reductive heterocyclizations where hydrogen embedded within an alcohol leaving group facilitates turnover.
丙烯酸苄酯与活化的酮和亚胺在镍催化下偶联,分别生成γ-丁内酯和内酰胺。内酯化/内酰胺化过程中释放的苯甲醇副产物被传递到下一个循环,在其中充当 CC 键形成的还原剂。该策略代表了一种概念上独特的转移氢化CC键形成方法,从而提供了还原性杂环化的例子,其中氢嵌入醇离去基团中促进周转。
Dual Behavior of Isatin-Based Cyclic Ketimines with Dicarbomethoxy Carbene: Expedient Synthesis of Highly Functionalized Spirooxindolyl Oxazolidines and Pyrrolines
作者:T. Rajasekaran、G. Karthik、B. Sridhar、B. V. Subba Reddy
DOI:10.1021/ol400287q
日期:2013.4.5
devised for the synthesis of a wide range of spirooxindolyl oxazolidines via an intermolecular 1,3-dipolarcycloaddition of carbonyl ylides generated from dimethyl diazomalonate and aromatic aldehydes, with cyclic ketimines using 5 mol % of Rh2(OAc)4 under mild conditions. Similarly, highly functionalized spirooxindolyl pyrrolines have also been prepared through1,3-dipolarcycloaddition of azomethine
Chiral Squaramide-Catalyzed Asymmetric Mannich Reactions for Synthesis of Fluorinated 3,3′-Bisoxindoles
作者:Bing-Yu Li、Da-Ming Du
DOI:10.1002/adsc.201800513
日期:2018.8.17
squaramide‐catalyzed asymmetric Mannichreaction of 3‐fluorooxindoles to isatin‐derived imines for synthesis of fluorinated 3,3′‐bisoxindoles with two contiguous stereocenters under mild conditions was developed. The corresponding 3,3′‐bisoxindoles were obtained in excellent yields with excellent diastereo‐ and enantioselectivities (up to 99% yield, >99:1 dr and >99% ee). What's more, this reaction can be gram‐scaled
Imidazolylpyridine-In(OTf)<sub>3</sub> catalyzed enantioselective allylation of ketimines derived from isatins
作者:Tingting Chen、Chun Cai
DOI:10.1039/c6ob00551a
日期:——
An enantioselective In(OTf)3-catalyzed allylation of ketimines derived from isatins in the presence of an imidazolylpyridine ligand is described. The reaction proceeded smoothly under mild conditions and resulted in 3-allyl 3-aminooxindoles with good yields and moderate to excellent enantioselectivities (up to 97% ee).
Rh2(OAc)4 catalyzed substrate selective [4+2]/[2+2] cycloaddition of acylketenes: a highly chemo- and regioselective synthesis of spiro(oxindolyl)oxazinones and β-lactams
A rhodium(II) catalyzed [4+2]/[2+2] cycloaddition reaction of N-protected isatin-3-arylimine with acylketene derived from α-diazocarbonyl compounds has been achieved for the first time for the preparation of a novel class of spiro(oxindolyl)oxazinone and spiro(oxindolyl)-β-lactam derivatives.