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
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)。
Intramolecular alkene arylations for rapid assembly of polycyclic systems containing quaternary centers. A new synthesis of spirooxindoles and other fused and bridged ring systems
作者:Matthew M. Abelman、Taeboem Oh、Larry E. Overman
DOI:10.1021/jo00227a038
日期:1987.9
Non-toxic ligands in samarium diiodide-mediated cyclizations
Samarium diiodide-mediated cyclizations of aryl radicals carried out in the presence of several nitrogen ligands(triethylamine, 1,8-diazabyciclo[5.4.0]undec-7-ene and 1,1-3,3-Tetramethylguanidine)are described. The yields and the selectivities observed are comparable to the ones obtained by using hexamethylphosphoramide.
CLARK, ANDREW J.;JONES, KEITH, TETRAHEDRON LETT., 30,(1989) N0, C. 5485-5488