Access to 2-Alkyl/Aryl-4-(1<i>H</i>)-Quinolones via Orthogonal “NH<sub>3</sub>” Insertion into <i>o</i>-Haloaryl Ynones: Total Synthesis of Bioactive Pseudanes, Graveoline, Graveolinine, and Waltherione F
An efficient one-pot synthesis of 4-(1H)-quinolones through an orthogonal engagement of diverse o-haloaryl ynones with ammonia in the presence of Cu(I), involving tandem Michael addition and ArCsp2-N coupling, is presented. The substrate scope of this convenient protocol, wherein ammonium carbonate acts as both an in situ ammonia source and a base toward diverse 2-substituted 4-(1H)-quinolones, has
Nitromethane as a Carbanion Source for Domino Benzoannulation with Ynones: One‐Pot Synthesis of Polyfunctional Naphthalenes and a Total Synthesis of Macarpine
applicability has been devised for the regioselective synthesis of polyfunctional naphthalenes by employing nitromethane and ortho‐haloaryl ynones. Utilization of nitromethane as a one carbon carbanion source that is incorporated into a variety of ynones, ends up as an aromatic nitro substituent. The application of this domino process towards a total synthesis of the polycyclic alkaloid macarpine demonstrate
的单釜,过渡金属-自由,多米诺迈克尔/ S Ñ普遍适用性的Ar协议已经通过使用硝基甲烷和设计用于多官能萘的区域选择性合成邻-haloaryl ynones。硝基甲烷作为一种碳碳负离子源的使用,并被引入到各种炔酮中,最终以芳族硝基取代基的形式出现。该多米诺法在多环生物碱马卡平的全合成中的应用证明了该方法的有效性。在概念上是简单的方法来影响ynones显示广泛的底物范围和官能团耐受性,并已与被取代的硝基甲烷实现的区域选择性,多功能benzoannulation以及与脂环ö-单倍体。
Gold‐Catalyzed Oxidation/C−H Functionalization of Ynones: Efficient and Rapid Access to Functionalized Polycyclic Salicyl Ketones
An efficient strategy to construct salicyl ketones through gold‐catalyzed oxidation/C−H functionalization of ynones is reported. A variety of functionalized salicyl ketones are readily accessed by utilizing this non‐diazo approach, thus providing a viable alternative to synthetically useful salicyl ketones with a yield up to 98 %. The α‐oxo gold carbenes generated in situ through gold‐catalyzed oxidation
Tandem synthesis of 3-allyl-chromones from alkynones and allylic alcohols under metal-free conditions
作者:Xuesong Wang、Guolin Cheng、Xiuling Cui
DOI:10.1039/c3cc48259f
日期:——
A novel and efficient approach to 3-allyl-chromones from alkynones and allylic alcohols via a tandem Michael addition-Claisen rearrangement-O-arylation reaction has been developed. Diversely structural 3-allyl-chromones were afforded in up to 93% yield for 24 examples. This synthetic strategy is regiospecific, highly efficient, environment friendly and metal-free.
Pd-Catalyzed Asymmetric Amination of Enamines: Expedient Synthesis of Structurally Diverse N–C Atropisomers
作者:Peng Zhang、Chang-Qiu Guo、Wang Yao、Chuan-Jun Lu、Yingzi Li、Robert S. Paton、Ren-Rong Liu
DOI:10.1021/acscatal.3c00732
日期:2023.6.2
The transition-metal-catalyzed cross-coupling of enamines is an attractive method for producing compounds with an N–C chiral axis; however, it faces considerable challenges that remain unresolved. Herein, a palladium-catalyzed amination method was developed to construct structurally diverse five–six biaryl and six–six nonbiaryl N–C atropisomers. The reaction mechanism was explained using density functional