A Strategy To Obtain <i>o</i>-Naphthoquinone Methides: Ag(I)-Catalyzed Cyclization of Enynones for the Synthesis of Benzo[<i>h</i>]chromanes and Naphthopyryliums
作者:Feng Wu、Shifa Zhu
DOI:10.1021/acs.orglett.9b00281
日期:2019.3.1
of 2-alkenylphenyl alkynyl ketones and its [4 + 2] annulations with styrenes has been developed. This reaction features high efficiency, mild reaction conditions, as well as flexible substitutions and atom economy. The obtained benzo[h]chromane products were further oxidized to naphthopyryliums, which displayed tunable photophysical properties.
已开发出一种通过Ag(I)催化2-烯基苯基炔基酮的环化反应及其[4 + 2]与苯乙烯的环化反应,通过成环策略获得o -NQM中间体的新策略。该反应具有高效,温和的反应条件,灵活的取代和原子经济性等特点。所获得的苯并[ h ]苯并二氢吡喃产物被进一步氧化成萘并具有可调节的光物理性质。
FeCl<sub>3</sub>-Catalyzed Intramolecular Michael Reaction of Styrenes for the Synthesis of Highly Substituted Indenes
作者:Dattatraya H. Dethe、Ganesh M. Murhade、Sourav Ghosh
DOI:10.1021/acs.joc.5b01071
日期:2015.8.21
An intramolecular FeCl3-catalyzed Michael addition reaction of styrene, a poor nucleophile, onto α,β-unsaturated ketones was developed for the synthesis of highly substituted indene derivatives. The method was further applied to the total synthesis of the sesquiterpene natural products (±)-jungianol and 1-epi-jungianol.
Rhodium(II)- or Copper(I)-Catalyzed Formal Intramolecular Carbene Insertion into Vinylic C(sp<sup>2</sup>
)−H Bonds: Access to Substituted 1<i>H</i>
-Indenes
作者:Qi Zhou、Shichao Li、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201709375
日期:2017.12.11
A rhodium(II)‐ or copper(I)‐catalyzed formal intramolecular carbene insertion into vinylic C(sp2)−H bonds is reported herein. This method provides straightforward access to 1H‐indenes with high efficiency and excellent functional‐group compatibility. Mechanistically, the reaction is proposed to involve the following sequence: metal carbene formation, intramolecular nucleophilic addition of the double
Hydroacylation of 2-Vinyl Benzaldehyde Systems: An Efficient Method for the Synthesis of Chiral 3-Substituted Indanones
作者:Kousik Kundu、James V. McCullagh、Andrew T. Morehead
DOI:10.1021/ja0564416
日期:2005.11.23
Asymmetricrhodium-catalyzedhydroacylation has been utilized in the synthesis of 3-substituted indanones with high conversions and enantioselectivity. The hydroacylationreaction of 2-vinyl benzaldehyde had been previously reported to give a low yield of indanone and an unidentified product. We have identified this compound as a dimer of the starting material. Substitution at the alpha-position of
describe a catalytic asymmetric iminium ion cyclization reaction of simple 2-alkenylbenzaldimines using a BINOL-derived chiral N-triflyl phosphoramide. The corresponding 1-aminoindenes and tetracyclic 1-aminoindanes are formed in good yields and high enantioselectivities. Further, the chemical utility of the obtained enantiopure 1-aminoindene is demonstrated for the asymmetric synthesis of (S)-rasagiline
我们描述了使用 BINOL 衍生的手性N-三氟甲基磷酰胺的简单 2-烯基苯甲醛二亚胺的催化不对称亚胺离子环化反应。相应的 1-氨基茚和四环 1-氨基茚以良好的产率和高对映选择性形成。此外,所获得的对映体纯 1-氨基茚的化学效用被证明用于 ( S )-雷沙吉兰的不对称合成。