Access to Densely Functionalized Chalcone Derivatives with a 2-Pyridone Subunit via Pd/Cu-Catalyzed Oxidative Furan–Yne Cyclization of <i>N</i>-(2-Furanylmethyl) Alkynamides under Air
A protocol for synthesis of chalcone derivatives with a 2-pyridone subunit from N-(2-furanylmethyl) alkynamides is reported. This synthesis involves Pd/Cu-catalyzed oxidative furan–yne cyclization at room temperature in air and may proceed via nucleopalladation of the alkyne to form a vinylpalladium intermediate, with a furan ring acting as the nucleophile.
Methyl-triflate-mediated dearylmethylation of <i>N</i>-(arylmethyl)carboxamides <i>via</i> the retro-Mannich reaction induced by electrophilic dearomatization/rearomatization in an aqueous medium at room temperature
Dearylmethylation of N-(arylmethyl)carboxamides was achieved under metal-free conditions in an aqueous medium induced by electrophilic dearomatization/rearomatization.
在无金属条件下,在水介质中通过亲电脱芳香化/重芳香化实现了N-(芳甲基)羧酰胺的去芳甲基化。
Synthesis of Spiro-lactams and Polysubstituted Pyrroles via Ceric Ammonium Nitrate-Mediated Oxidative Cyclization of <i>N</i>-Furan-2-ylmethyl-β<i>-</i>Enaminones
Spiro-lactams and polysubstituted pyrroles were synthesized by reactions of furfurylamines with ynones followed by oxidation. Specifically, the protocol involved in situ generation of N-furan-2-ylmethyl-β-enaminones and their subsequent oxidation by ceric ammonium nitrate (6 equiv for spiro-lactam formation, 3 equiv for pyrrole formation). This useful dearomatizing oxidation, which likely proceeds via a
Direct Reductive Amination of Biobased Furans to
<i>N</i>
‐Substituted Furfurylamines by Engineered Reductive Aminase
作者:Zi‐Yue Yang、Ya‐Cheng Hao、Song‐Qing Hu、Min‐Hua Zong、Qi Chen、Ning Li
DOI:10.1002/adsc.202001495
日期:2021.2.16
Furfurylamines are importantbuildingblocks for the synthesis of many pharmacologically active compounds and polymers. In this work, direct reductive amination of biobased furans to N‐substituted furfurylamines by reductive aminase from Aspergillus oryzae (AspRedAm) was reported. Besides the reductive aminase activity, AspRedAm also showed a promiscuous, yet low alcohol dehydrogenase activity. The