Stereoselective synthesis of spirocyclic oxindoles based on a one-pot Ullmann coupling/Claisen rearrangement and its application to the synthesis of a hexahydropyrrolo[2,3-b]indole alkaloid
efficient and convenient approach to the synthesis of spirocyclicoxindoles from iodoindoles has been developed. The most striking feature of this approach is that the sequential intramolecular Ullmann coupling and Claisen rearrangement proceeds in a one-pot manner to afford 3-spiro-2-oxindoles in good yield with excellent diastereoselectivity. Application of this one-pot reaction to chiral non-racemic
Construction of Quaternary Stereocenters by Nickel‐Catalyzed Heck Cyclization Reactions
作者:Jean‐Nicolas Desrosiers、Liana Hie、Soumik Biswas、Olga V. Zatolochnaya、Sonia Rodriguez、Heewon Lee、Nelu Grinberg、Nizar Haddad、Nathan K. Yee、Neil K. Garg、Chris H. Senanayake
DOI:10.1002/anie.201606955
日期:2016.9.19
A nickel‐catalyzedHeckcyclization for the construction of quaternarystereocenters is reported. This transformation is demonstrated in the synthesis of 3,3‐disubstituted oxindoles, which are prevalent motifs seen in numerous biologically active molecules. The method shows broad scope, proceeds in synthetically useful yields, and provides a rare means to construct stereochemically complex frameworks
The Application of HETPHOX Ligands to the Intramolecular Asymmetric Heck Reaction
作者:Patrick Guiry、Martin Fitzpatrick、Anthony Coyne
DOI:10.1055/s-2006-951500
日期:2006.11
A new thiophene-oxazoline P,N ligand derived from cis-aminoindanol was prepared and a range of analogous HETPHOX ligands were applied to the intramolecular Heck reaction. The enantioselectivity obtained was 76% employing the tert-butyl-substituted HETPHOX ligand with an aryl triflate spirooxindole precursor. The isomer distribution of the product spirooxindoles was high (up to 99:1).
The palladiumcatalysed reactions of 2-halophenols and -anilines with vinyl halides or triflates and CO(1atm) generates 3-spiro-2-oxindoles and 3-spiro-2(3H)-benzofuranones. Analogous tetramolecular reactions employing norbornenyl triflate and organo-tin(IV) or -boron(III) reagents allow additional functionality to be incorporated regio- and stereo-specifically.
Heck reaction of N-(2-halophenyl)-N-methyl-1-cyclohexene-1-carboxamide (1) and 2-bromo-N-methyl-N-phenyl-1-cyclohexene-1-carboxamide (4) using a palladium reagent under several reaction conditions was examined. Reaction of 4 using Pd(OAc) 2 , DPPP, and Bu 3 P afforded tetrahydrophenanthridone (5) in excellent yield.
N-(2-卤代苯基)-N-甲基-1-环己烯-1-甲酰胺(1)和2-溴-N-甲基-N-苯基-1-环己烯-1-甲酰胺(4)的Heck反应使用检查了几种反应条件下的钯试剂。4 使用 Pd(OAc) 2 、DPPP 和 Bu 3 P 反应以优异的收率得到四氢菲啶酮 (5)。