Interrupting the [Au]-Catalyzed Nitroalkyne Cycloisomerization: Trapping the Putative α-Oxo Gold Carbene with Benzo[<i>c</i>]isoxazole
作者:Pawan S. Dhote、Chepuri V. Ramana
DOI:10.1021/acs.orglett.1c00539
日期:2021.4.2
interrupted by possible trapping of the postulated intermediate α-oxo gold carbene with an external nucleophile such as benzo[c]isoxazole (anthranil). At the outset, this provides a simple synthesis of highly functionalized 3-acyl-(2-formylphenyl)-2H-indazoles with the sequential C–O, C–N, and N–N bond formations. This provides indirect support for the existence of α-oxo gold carbenes in the [Au]-catalyzed internal
通过假想的中间体α-氧代金卡宾可能被外部亲核试剂(例如苯并[ c ]异恶唑(蒽))捕获,从而中断了导致蒽基的2-炔基硝基苯的Au催化硝基炔环异构化。首先,它提供了具有连续C–O,C–N和N–N键形成的高度官能化的3-酰基-(2-甲酰基苯基)-2 H-吲唑的简单合成方法。这为在α-催化的炔炔的内部氧化还原过程中α-氧羰金的存在提供了间接支持。
One-Pot Au[III]-/Lewis Acid Catalyzed Cycloisomerization of Nitroalkynes and [3 + 3]Cycloaddition with Donor–Acceptor Cyclopropanes
作者:Pawan S. Dhote、Chepuri V. Ramana
DOI:10.1021/acs.orglett.9b02035
日期:2019.8.16
tricyclic pseudoindoxyl scaffold from 2-nitroalkynylbenzenes, comprising of an Au(III)-catalyzed nitroalkyne cycloisomerization leading to isatogen and its [3 + 3]-cycloaddition with donor–acceptorcyclopropanes mediated by a suitable Lewisacid, has been developed.
Phosphinito palladium(<scp>ii</scp>) complexes as catalysts for the synthesis of 1,3-enynes, aromatic alkynes and ynones
作者:R. E. Islas、J. Cárdenas、R. Gaviño、E. García-Ríos、L. Lomas-Romero、J. A. Morales-Serna
DOI:10.1039/c6ra28855c
日期:——
catalyst in the formation of C–C bonds. The coupling of terminalalkynes formed gem-1,3-enynes as the only reaction products. Aromatic alkynes can be synthesized from the coupling of terminalalkynes and haloaromatic compounds (Sonogashira coupling). The phosphinito palladium(II) complex also catalyses the coupling between acyl chlorides and terminalalkynes (Sonogashira coupling), furnishing ynones in excellent
Copper-Catalyzed Radical Difluoroalkylation and Redox Annulation of Nitroalkynes for the Construction of C2-Tetrasubstituted Indolin-3-ones
作者:Wenqiang Fu、Qiuling Song
DOI:10.1021/acs.orglett.7b03678
日期:2018.1.19
An efficient and convenient method with wide applicability for the synthesis of C2-tetrasubstituted indolin-3-ones via copper-catalyzed redox cycloisomerization of nonprefunctionalized nitroalkynes has been developed. This protocol features simple operation, readily available starting materials, good functional group tolerance, broad scope, and diboron as the reductant.
One-Pot Synthesis of Indole Derivatives from the Reaction of Nitroalkynes and Alkynes via a Mercury-Carbene Intermediate
作者:Shifa Zhu、Min Zheng、Kai Chen
DOI:10.1055/s-0036-1588416
日期:2017.9
Published as part of the Special Topic Modern Cyclization Strategies in Synthesis Abstract The cyclization of nitroalkyne catalyzed by Hg(OTf)2 to produce the corresponding benzo[c]isoxazole in excellent yields with high selectivity is reported. On the basis of this strategy, a one-pot method to synthesize indolederivatives has been developed. In this transformation, two Hg-carbene intermediates are
作为专题“现代合成中的环化策略”的一部分发布 抽象的 据报道,Hg(OTf)2催化硝基炔的环化反应,以高收率和高选择性产生相应的苯并[ c ]异恶唑。在这种策略的基础上,开发了一种一锅合成吲哚衍生物的方法。在该转化中,提出了涉及两个Hg-卡宾中间体。 据报道,Hg(OTf)2催化硝基炔的环化反应,以高收率和高选择性产生相应的苯并[ c ]异恶唑。在这种策略的基础上,开发了一种一锅合成吲哚衍生物的方法。在该转化中,提出了涉及两个Hg-卡宾中间体。