A novel method to synthesize isoquinolones via oxidative annulation of N‐alkoxy benzamides and alkynes using binaphthyl‐stabilized palladium nanoparticles (Pd‐BNP) as catalyst has been developed. This methodology affords various isoquinolone derivatives in good to excellent yields with high regioselectivities in the presence of air as oxidant. N‐Methoxybenzothioamide was also found to undergo oxidative
Rhodium-Catalyzed and Chiral Zinc Carboxylate-Assisted Allenylation of Benzamides via Kinetic Resolution
作者:Ruxia Mao、Yanliang Zhao、Xiaohan Zhu、Fen Wang、Wei-Qiao Deng、Xingwei Li
DOI:10.1021/acs.orglett.1c02398
日期:2021.9.17
In this work, kinetic resolution of tertiary propargyl alcohols as an allenylating reagent has been realized via rhodium(III)-catalyzed C–H allenylation of benzamides. The reaction proceeded efficiently under mild conditions, and both the allenylated products and the propargyl alcohols were obtained in high enantioselectivities with an s-factor of up to 139. The resolution results from bias of the
the alkyne in redox‐neutral annulation with benzamides, with alkyne insertion being stereodetermining. The reaction accommodates both benzamides and heteroaryl carboxamides and proceeds in excellent regioselectivity (if applicable) and enantioselectivities (average 91.8 % ee ). An enantiomerically and diastereomerically pure rhodacyclic complex was prepared and offers insight into enantiomeric control
Redox-neutral rhodium(<scp>iii</scp>)-catalyzed chemo- and regiospecific [4 + 1] annulation between benzamides and alkenes for the synthesis of functionalized isoindolinones
作者:Jin Qiao、Hui Mao、Shiyao Lu、Xiaoning Zhang、Hangcheng Ni、Yangbin Lu
DOI:10.1039/d1ob01792f
日期:——
Herein, using electron-deficient alkenes embedded with an oxidizing function/leaving group as a rare and nontraditional C1 synthon, we have achieved the redox-neutralRh(III)-catalyzed chemo- and regioselective [4 + 1] annulation of benzamides for the synthesis of functionalized isoindolinones. This method features broad substrate scope, good to excellent yields, excellent chemo- and regioselectivity
在此,我们使用嵌入氧化功能/离去基团的缺电子烯烃作为稀有和非传统的 C 1合成子,实现了氧化还原中性 Rh( III ) 催化的化学和区域选择性 [4 + 1] 苯甲酰胺环化功能化异吲哚啉酮的合成。该方法具有广泛的底物范围、良好的收率、优异的化学和区域选择性、良好的官能团耐受性和温和的无外部氧化剂条件。