Room-Temperature Synthesis of Trisubstituted Allenylsilanes via Regioselective C–H Functionalization
摘要:
A Rh(III)-catalyzed o-C-H bond functionalization-based allenylation reaction of allenylsilanes 2 with N-methoxybenzamides 1 affords poly-substituted allenylsilanes with a wide range of attractive functional groups in moderate to excellent yields under very mild conditions (20 degrees C, compatible with ambient air and moisture). Those products may be transformed to different products with attractive structural features. Careful mechanistic studies suggest the reaction proceeds via o-rhodation, regioselective insertion, and beta-H elimination.
Highly Selective Mild Stepwise Allylation of <i>N</i>-Methoxybenzamides with Allenes
作者:Rong Zeng、Chunling Fu、Shengming Ma
DOI:10.1021/ja303790s
日期:2012.6.13
allylation of N-methoxybenzamides 1 with polysubstituted allenes is reported. This C-H functionalization involving allenes is conducted under very mild conditions (-20 °C or room temperature) and compatible with ambient air and moisture, and it can be applied to terminal or internal allenes with different synthetically attractive functional groups. Highly efficient axial chirality transfer has been realized
报道了 N-甲氧基苯甲酰胺 1 与多取代丙二烯的有效 Rh(III) 催化逐步邻位烯丙基化。这种涉及丙二烯的 CH 官能化是在非常温和的条件下(-20 °C 或室温)进行的,并且与环境空气和水分兼容,它可以应用于具有不同合成吸引力官能团的末端或内部丙二烯。已经实现了高效的轴向手性转移,产生了光学活性内酯。
Synthesis of Phenanthridinones from<i>N</i>-Methoxybenzamides and Aryltriethoxysilanes through Rh<sup>III</sup>-Catalyzed CH and NH Bond Activation
An efficient method for the one‐pot synthesis of substituted phenanthridinone derivatives from N‐methoxybenzamides and aryltriethoxysilanes through rhodium‐catalyzed dual CHbondactivation and annulation reactions is described. A double‐cycle mechanism is proposed to account for this catalytic reaction. In addition, isotope‐labeling studies were performed to understand the intimate mechanism of the
One-pot cascade synthesis of N-methoxyisoquinolinediones via Rh(<scp>iii</scp>)-catalyzed carbenoid insertion C–H activation/cyclization
作者:Jingjing Shi、Jie Zhou、Yunnan Yan、Jinlong Jia、Xuelei Liu、Huacan Song、H. Eric Xu、Wei Yi
DOI:10.1039/c4cc08407a
日期:——
new, mild and versatile method for one-pot cascade synthesis of diverse N-methoxyisoquinolinediones via Rh(III)-catalyzedregioselectivecarbenoidinsertionC-H activation/cyclization of N-methoxybenzamides with alpha-diazotized Meldrum'sacid has been achieved. Extension of the developed Rh(III) catalysis for building new analogs of the marketed drug Edaravone has also been demonstrated.
An efficient method for the synthesis of functionalized vinyl arenes from the reaction of N-methoxybenzamides or N-phenoxyacetamides with vinylstannanes via rhodium(iii)-catalyzed C–H activation is described. The application of the methodology for the synthesis of a natural product thalactamine and a 7-membered ring oxepine are also demonstrated.
General solution: An efficient rhodium‐catalyzed dual CH bond activation and cyclization of N‐methoxybenzamides 1 with aryl boronic acids 2 (see scheme; Cp*=Me5C5) provides a straightforward and general approach to the phenanthridinone structure, which occurs widely in natural products and drugs. Highly regioselective CC and CN bond formation under mild conditions afforded a wide range of substituted
通用解决方案:有效的铑催化的双CH键活化和N-甲氧基苯甲酰胺1与芳基硼酸2的环化(参见方案; Cp * = Me 5 C 5)提供了一种直接而通用的方法用于菲咯啶酮结构,广泛存在于天然产物和药物中。在温和条件下形成高度区域选择性的CC和CN键可提供广泛的取代菲啶酮3。