已经开发了一种直接,简洁且原子经济的合成方法,该方法使用金催化的二炔级联环化生成稠合的吲哚。该反应通过分子内级联5-内-挖-加氢胺化,然后进行6-氨基苯甲酸酯化,得到了各种稠合的吲哚,例如芳基环化的[ α ]咔唑,二氢苯并[ g ]吲哚和氮杂环庚烷-或氧代庚并吲哚衍生物,收率良好。或7-内挖式环异构化,而不会产生理论副产物。所得的三支吲哚对T表现出有效的抗真菌活性。癣菌和Ť。风疹,说明了所描述的级联反应在药物发现中的实际应用。
Grignard Reagent/CuI/LiCl-Mediated Stereoselective Cascade Addition/Cyclization of Diynes: A Novel Pathway for the Construction of 1-Methyleneindene Derivatives
作者:De-Yao Li、Yin Wei、Min Shi
DOI:10.1002/chem.201302191
日期:2013.11.11
Diynes containing a cyclopropane group smoothly undergo a novel intramolecular and stereoselective cascade addition/cyclization reaction to produce the corresponding 1‐methyleneindene derivatives in moderate to good yields. This interesting transformation is mediated by Grignard reagent/CuI with LiCl as an additive under mild conditions. The obtained product can easily be further functionalized through
Simple Gold-Catalyzed Synthesis of Benzofulvenes-<i>gem</i>-Diaurated Species as “Instant Dual-Activation” Precatalysts
作者:A. Stephen K. Hashmi、Ingo Braun、Pascal Nösel、Johannes Schädlich、Marcel Wieteck、Matthias Rudolph、Frank Rominger
DOI:10.1002/anie.201109183
日期:2012.4.27
Alkyl‐substituted diynes deliver benzofulvenes in a unique gold‐catalyzed reaction. The catalytic cycle involves the formation of gold acetylides by alkynyl C–H activation, the formation of vinylidene gold(I) intermediates by dual activation, and alkyl C–H activation by the vinylidene gold(I) species. gem‐Diaurated species obtained from the catalysis reactions prove to be highly active catalysts for
Synthesis of C–N Axially Chiral N-Arylbenzo[g]indoles via a Central-to-Axial Chirality Conversion Strategy
作者:Yuan Sun、Lingzhi Sun、Shaoting Zhang、Zunting Zhang、Tao Wang
DOI:10.1021/acs.orglett.4c01576
日期:2024.6.7
Gold-catalyzed cascade cyclization of diynes for the synthesis of previously unexplored C–Naxially chiral N-arylbenzo[g]indoles was described. The transformation was achieved via a central-to-axial chirality conversion strategy. The chiral conversion exhibited high efficiency. Besides single C–N chiral axis, N-arylbenzo[g]indoles bearing both C–N and C–C chiral axes were also afforded. The title compound
描述了金催化二炔级联环化,用于合成先前未探索的 C-N 轴向手性N-芳基苯并[ g ]吲哚。这种转变是通过中心到轴的手性转换策略实现的。手性转化表现出高效率。除了单一的C-N手性轴外,还提供了带有C-N和C-C手性轴的N-芳基苯并[ g ]吲哚。制备了标题化合物衍生的单膦配体,并在 Pd 催化的不对称烯丙基取代中进行了评估,显示出优异的手性诱导能力。
An Intramolecular Reaction between Pyrroles and Alkynes Leads to Pyrrole Dearomatization under Cooperative Actions of a Gold Catalyst and Isoxazole Cocatalysts
作者:Satish Bhausaheb Dawange、Rai-Shung Liu
DOI:10.1021/acs.orglett.4c02601
日期:2024.8.30
The gold-catalyzed one-pot synthesis of 3H-benzo[e]isoindoles (3) from a mixture of isoxazole (2) and diynamides (1) is described. This tandem catalysis involves two separate steps: (i) initial synthesis of 2-(3-pyrrolyl)-1-alkynylbenzenes and (ii) a novel alkyne/pyrrole coupling reaction through pyrrole dearomatization. Our control experiments reveal the cooperative action of the gold catalyst and
描述了由异恶唑( 2 )和二炔酰胺( 1 )的混合物金催化一锅法合成3H-苯并[ e ]异吲哚( 3 )。这种串联催化涉及两个独立的步骤:(i)2-(3-吡咯基)-1-炔基苯的初始合成和(ii)通过吡咯脱芳构化的新型炔/吡咯偶联反应。我们的对照实验揭示了金催化剂和异恶唑助催化剂的协同作用,使新型炔/吡咯偶联能够导致 1,2-酰基转移。