Palladium-catalyzed oxidative cyclization of aniline-tethered alkylidenecyclopropanes with O<sub>2</sub>: a facile protocol to selectively synthesize 2- and 3-vinylindoles
作者:Bo Cao、Marwan Simaan、Ilan Marek、Yin Wei、Min Shi
DOI:10.1039/c6cc08731k
日期:——
A novel palladium-catalyzedoxidative cyclization of aniline-tethered alkylidenecyclopropanes using molecularoxygen as terminal oxidant through [small beta]-carbon elimination of aminopalladation intermediates is disclosed. The reaction opens up an effective way to...
Catalyst-free geminal aminofluorination of <i>ortho</i>-sulfonamide-tethered alkylidenecyclopropanes <i>via</i> a Wagner–Meerwein rearrangement
作者:Xing Fan、Qiang Wang、Yin Wei、Min Shi
DOI:10.1039/c8cc05634j
日期:——
give a fluorinated cyclopropylcarbinyl cation and a further Wagner-Meerweinrearrangement to generate a cyclobutyl carbocation, which undergoes intramolecular nucleophilic capture by amide to forge fluorinated cyclobuta[b]indoline derivatives. A polycyclic multi-fluorinated byproduct was also formed through a Ritter-type reaction in some cases.
已经开发了无催化剂的邻-磺酰胺系的亚烷基亚环丙烷的分子内双核氨基氟化。通过与的SElectfluor两个SET过程进行该反应,得到氟化cyclopropylcarbinyl阳离子和进一步瓦格纳米尔文重排,以生成碳正离子环丁基,其通过酰胺进行分子内亲核捕获伪造氟化cyclobuta [ b ]二氢吲哚衍生物。在某些情况下,还通过Ritter型反应形成多环多氟化副产物。
Visible-light-mediated intramolecular radical cyclization of α-brominated amide-tethered alkylidenecyclopropanes
作者:Ben Mao、Xiao-Yu Zhang、Yin Wei、Min Shi
DOI:10.1039/d1cc07136j
日期:——
A ring-opening/cyclization cascade reaction of α-brominated amide-tethered alkylidenecyclopropanes in the presence of photocatalyst 4CzIPN under visible-light irradiation was developed to afford polycyclic benzazepine derivatives in good yields with broad substrate scope and good functional tolerance. A plausible mechanism involving a halogen atom transfer (XAT) process and a radical chain process is
Nickel-Catalyzed Synthesis of Benzo[<i>b</i>]naphtho[1,2-<i>d</i>]azepine via Intramolecular Radical Tandem Cyclization of Alkyl Bromide-Tethered Alkylidenecyclopropanes
作者:Bo Jiang、Jia-Xin Liu、Yin Wei、Min Shi
DOI:10.1021/acs.orglett.8b02699
日期:2018.10.5
A Ni(II)-catalyzed tandem cyclopropane ring opening and radical alkylation of the aromatic ring using unactivated alkyl bromide-tethered alkylidenecyclopropanes (ACPs) have been described in this paper. This ring-forming process exhibits a broad substrate scope with a variety of primary alkyl bromides and aromatic rings, affording diversified benzo[b]naphtho[1,2-d]azepine derivatives in moderate-to-excellent
本文描述了Ni(II)催化的串联环丙烷丙烷开环和使用未活化的烷基溴-束缚的亚烷基环丙烷(ACP)对芳环进行自由基烷基化。这种成环过程显示出具有多种伯烷基溴和芳族环的广泛底物范围,在温和条件下以中等至优异的产率提供了多种苯并[ b ]萘[1,2- d ] a庚因衍生物。在包括氘标记检查在内的几个对照实验的基础上,提出了合理的反应机理。还对获得的多环产物进行了进一步的衍生化。
Thermal induced intramolecular [2 + 2] cycloaddition of allene-ACPs
作者:Kai Chen、Run Sun、Qin Xu、Yin Wei、Min Shi
DOI:10.1039/c3ob40911b
日期:——
A facile synthetic method for preparation of bicyclo[4.2.0] nitrogen heterocycles has been developed via a thermal induced intramolecular [2 + 2] cycloaddition reaction of allene-ACPs. The DFT calculations indicate that this intramolecular cycloaddition proceeds in a concerted manner and a strained small ring is essential.