Rhodium-catalyzed three-component reaction of 3-diazooxindoles with indoles and isatin-derived ketimines: a facile and versatile approach to functionalized 3,3′,3′′-trisindoles
In the presence of DIPEA (diisopropylethylamine), a formal [3+2] cycloaddition reaction between diazooxindoles and oxazol‐5‐(4H)‐ones takes place easily to give new 3‐(1H‐1,2,4‐triazol‐1‐yl)indolin‐2‐ones in 61–98 % yield. The structure of the target molecules was confirmed by single‐crystal X‐ray structure analysis.
在存在DIPEA(二异丙基乙胺)的情况下,重氮恶唑与恶唑-5-(4 H)-酮之间的[3 + 2]环加成反应很容易发生,从而生成新的3-(1 H -1、1,2,4-三唑‐1-yl)indolin-2-ones的产率为61–98%。通过单晶X射线结构分析确认了目标分子的结构。
One-Pot Tandem Diastereoselective and Enantioselective Synthesis of Functionalized Oxindole-Fused Spiropyrazolidine Frameworks
作者:Liang-Yong Mei、Xiang-Ying Tang、Min Shi
DOI:10.1002/chem.201403990
日期:2014.10.6
A highly efficient palladium(0)‐catalyzed asymmetric [3+2] cycloaddition using 3‐diazooxindoles serving as dipolarophiles affords functionalized pyrazolidinederivatives in an atom‐economical way. In addition, by trapping the pyrazolidinederivatives with maleimides, the corresponding spiropyrazolidine oxindoles containing multiple stereogenic centers have been obtained in high yields along with moderate
Diastereodivergent synthesis of cyclopropanes <i>via</i> on-water [2 + 1] annulations of diazo compounds with electron-deficient alkenes
作者:Qing-Zhu Li、Xiang Zhang、Ke Xie、Qing-Song Dai、Rong Zeng、Yan-Qing Liu、Zhi-Qiang Jia、Xin Feng、Jun-Long Li
DOI:10.1039/c9gc00278b
日期:——
cyclopropanation of diazo compounds and electron-deficient alkenes under metal- and catalyst-freeconditions was developed. The use of water as the sole solvent dramatically increased the efficiency of the reaction. This on-water synthesis approach featured numerous advantages, including high yield, broad substrate scope and environmentally friendly conditions. Moreover, a simple substrate-engineering strategy was
Palladium-catalyzed asymmetric [3+2] cycloaddition to construct 1,3-indandione and oxindole-fused spiropyrazolidine scaffolds
作者:Bo Cao、Liang-Yong Mei、Xiao-Ge Li、Min Shi
DOI:10.1039/c5ra19838k
日期:——
A facile and versatile Pd/L8-catalyzed asymmetric [3+2] cycloaddition of 3-diazooxindoles with a new vinylcyclopropane to construct spiropyrazolidine derivatives has been developed.
Unified Strategy to Access 6<i>H</i>
-Benzofuro[2,3-<i>b</i>
]indoles and 5,6-Dihydroindolo[2,3-<i>b</i>
]indoles via UV Light-Mediated Diradical Cyclization
A unified protocol for the construction of 6H‐benzofuro[2,3‐b]indoles and 5,6‐dihydroindolo[2,3‐b]indolesviaUV light‐mediated diradicalcyclization was developed and preliminary efforts were also made to functionalize at C10b position of 6H‐benzofuro[2,3‐b]indoles. This mild and facile strategy may have great potential in the syntheses of natural products and functional materials.
为6建设的统一的协议ħ -benzofuro [2,3- b ]吲哚和5,6-二氢吲哚并[2,3- b ]吲哚通过UV光介导的环化双基,开发和初步努力也官能制成在6 H-苯并呋喃[2,3- b ]吲哚的C10b位置。这种温和而简便的策略可能在天然产物和功能材料的合成中具有巨大的潜力。