Generation of Rhodium(I) Carbenes from Ynamides and Their Reactions with Alkynes and Alkenes
摘要:
Rh(I) carbenes were conveniently generated from readily available ynamides. These metal carbene intermediates could undergo metathesis with electron-rich or neutral alkynes to afford 2-oxopyrrolidines or be trapped by tethered alkenes to yield 3-azabicyclo[3.1.0]-hexanes, a common skeleton in numerous bioactive pharmaceuticals. Although the scope of the former is limited, the latter reaction tolerates various substituted alkenes.
Gold(I)-Catalyzed 6-<i>endo</i>-Dig Hydrative Cyclization of an Alkyne-Tethered Ynamide: Access to 1,6-Dihydropyridin-2(3<i>H</i>)ones
作者:Nayan Ghosh、Sanatan Nayak、Akhila K. Sahoo
DOI:10.1002/chem.201301599
日期:2013.7.15
Hydrate your chemistry! Hydrativecyclization of 5‐yne‐ynamides in the presence of Echavarren's catalyst and p‐toluenesulphonic acid (PTSA)⋅H2O at room temperature affords an array of 1,6‐dihydropyridin‐2(3H)one derivatives. Isomerization, epoxidation, and hydrogenation of the double bond and insertion of an extended π‐conjugate system into the pyridinone skeleton have been successfully accomplished
Gold‐Catalyzed Annulations of
<i>N</i>
‐Propargyl Ynamides with Anthranils with Two Distinct Chemoselectivities
作者:Yu‐Chen Hsu、Shu‐An Hsieh、Rai‐Shung Liu
DOI:10.1002/chem.201806083
日期:2019.4.5
Gold‐catalyzedannulation of N‐propargyl ynamides with anthranils can proceed by two distinct mechanisms. In the case of a terminal N‐propargyl ynamide, its resulting α‐imino gold carbene reacts with a tethered alkyne to generate a vinyl cation to enable hydrolysis, which ultimately yields a pyrrolo[2,3‐b]quinoline derivative after treatment with p‐toluenesulfonic acid. For an internal alkyne, its
金催化的N-炔丙基乙酰胺与蒽的环化反应可以通过两种不同的机理进行。在末端N-炔丙基炔基酰胺的情况下,其生成的α-亚氨基金卡宾与链状炔反应生成乙烯基阳离子以实现水解,经p处理后最终生成吡咯并[2,3- b ]喹啉衍生物甲苯磺酸。对于内部炔烃,其α-亚氨基金卡宾通过乙烯基阳离子或烯基金卡宾与链状炔反应。两种途径最终都会导致生成4-酮-2-氨基吡咯衍生物。我们的机理分析表明,对于末端乙酰胺,水是比蒽乙更好的亲核试剂,而水和蒽甲对内部乙酰胺具有同等的反应性。
Generation of Donor/Donor Copper Carbenes through Copper-Catalyzed Diyne Cyclization: Enantioselective and Divergent Synthesis of Chiral Polycyclic Pyrroles
作者:Feng-Lin Hong、Ze-Shu Wang、Dong-Dong Wei、Tong-Yi Zhai、Guo-Cheng Deng、Xin Lu、Rai-Shung Liu、Long-Wu Ye
DOI:10.1021/jacs.9b09303
日期:2019.10.23
yields with wide substratescope and excellent enantioselectivities (up to 97:3 e.r.). Importantly, this protocol represents the first copper-catalyzed asymmetric diyne cyclization. Moreover, mechanisticstudies revealed that the generation of donor/donor copper carbenes is presumably involved in this 1,5-diyne cyclization, which is distinctively different from the related gold catalysis, and thus it constitutes
Copper-Catalyzed Asymmetric Reaction of Alkenyl Diynes with Styrenes by Formal [3 + 2] Cycloaddition via Cu-Containing All-Carbon 1,3-Dipoles: Access to Chiral Pyrrole-Fused Bridged [2.2.1] Skeletons
作者:Feng-Lin Hong、Yang-Bo Chen、Si-Han Ye、Guang-Yu Zhu、Xin-Qi Zhu、Xin Lu、Rai-Shung Liu、Long-Wu Ye
DOI:10.1021/jacs.0c01918
日期:2020.4.22
metal-containing 1,3-dipoles from metal carbenes represents a significant advance in 1,3-dipolar cycloaddition reactions. However, these transformations have so far been limited to reactions based on diazo compounds or triazoles as precursors. Herein, we disclose a copper-catalyzed enantioselective reaction of alkenyl N-propargyl ynamides with styrene derivatives by formal [3 + 2] cycloaddition via Cu-containing all-carbon
Metal-free stereoselective addition of propiolic acids to ynamides: a concise synthetic route to highly substituted enediyne/dienyne-(<i>E</i>)-<i>N</i>,<i>O</i>-acetals
作者:Rangu Prasad、Suresh Kanikarapu、Shubham Dutta、Srinivas Vangara、Akhila K. Sahoo
DOI:10.1039/d2nj01907h
日期:——
straightforward and sustainable approach for the 1,2-addition of propiolic acids to ynamide has led to bench-stable sp2 (E)-enol-enamides of enediynes and dienynes. The reaction is chemo-, regio-, and stereoselective and does not require metal catalysts and solvent. The ynamide motif is extremely amenable to functionalization in the presence of the tethered alkyne triple bond. The synthetic technique is operationally
一种直接且可持续的方法将 1,2-丙炔酸添加到 ynamide 中,导致了烯二炔和二炔的工作台稳定的 sp 2 ( E )-烯醇-烯酰胺。该反应具有化学选择性、区域选择性和立体选择性,不需要金属催化剂和溶剂。在存在栓系炔烃三键的情况下,ynamide 基序非常适合官能化。合成技术操作简单;在酸性条件下不会发生酮亚胺物种的水解。该转化容忍了广泛的常见官能团,构建了一个高度功能化的 1,5,5'/6'-烯二炔和 sp 2 ( E )- N , O -缩醛骨架的 1,5,5'-二烯的文库.