chemoselective double annulation of α-trifluoromethylated isocyanides with o-acylaryl isocyanides has been developed. This new reaction provides a rapid, efficient, and complete atom-economic strategy for the synthesis of trifluoromethylated oxadiazino[3,2-a]indoles in a single operation from readily available starting materials. Isocyanide insertion into C═O double bonds is disclosed for the first
已经开发出空前的α-三氟甲基化异氰酸酯与邻酰基芳基异氰酸酯的化学选择性双环。该新反应提供了快速,有效和完整的原子经济策略,可通过一次操作从容易获得的起始原料合成三氟甲基化的恶二嗪并[3,2- a ]吲哚。由18 O-标记实验的结果表明,异氰酸酯首次插入C = O双键。提出了这种多米诺反应的机制,其中包括两种不同异氰酸酯的化学选择性异二聚化,然后是吲哚-2,3-环氧化物的形成和重排。
Palladium-catalyzed synthesis of polysubstituted quinolines from 2-amino aromatic ketones and alkynes
作者:Wang Zhou、Jianhua Lei
DOI:10.1039/c4cc00939h
日期:——
A palladium-catalyzed one-pot method for the synthesis of quinolines from commercial or readily available 2-amino aromatic ketones and alkynes is reported for the first time. This transformation offers an alternative method for the synthesis of polysubstituted quinoline.
Synthesis of 1-Amino-2,2,2-trifluoroalkylphosphonates from Alkene-Tethered Trifluoroacetimidoyl Chlorides
作者:José F. Rodríguez、Anji Zhang、Ramon Arora、Mark Lautens
DOI:10.1021/acs.orglett.1c02750
日期:2021.10.1
The reaction of alkene-tethered trifluoroacetimidoylchlorides with trialkylphosphites furnishes 1-amino-2,2,2-trifluoroalkylphosphonates. The products were generated in moderate to good yields, and the scalability of this process was showcased. Partial hydrolysis of the phosphonate moiety was achieved. The cyclization is proposed to occur via formation of an imidoyl phosphonate intermediate that
phosphoranyl radical chemistry allows for precise cleavage of a stronger C-O bond and formation of a weaker C-Cbond by 1,5-aryl migration under mild reaction conditions. This new protocol is independent of substrate redox-potential, electronic, and substituent effects. It affords a general and promising access to 60 examples of synthetically versatile o-amino and o-hydroxy diaryl ketones under redox-neutral
A novel, one-pot, three-step synthetic method to prepare 2-aminobenzophenones from 2-alkynyl arylazides has been disclosed. This reaction is catalyzed by palladium to form 3-hydroxy-3-phenylindolin-2-ones, which is followed by hydrolysis of amide bonds and copper-catalyzed decarboxylation to generate 2-aminobenzophenones. The desired products are afforded in moderate to good yields under mild reaction