A relay catalytic cascade process involving Lewis acid triggered ring-opening of cyclopropyl ketones with nitriles, the copper(I)-catalyzed Ritter process, and acid-promoted N-acyliminium ion cyclization is described, which efficiently provides thieno-, furano-, and benzo-indolizinones in moderate to good yields.
Synthesis of some substituted pyrrolidines from cyclopropyl carbonyl compounds
作者:Keith W. Blake、Iain Gillies、Ronald C. Denney
DOI:10.1039/p19810000700
日期:——
A series of alkyl and aryl cyclopropylcarbonylcompounds, when refluxed in N-methylformamide in the presence of magnesium chloride, gave variously substitutedpyrrolidines.
当在氯化镁存在下在N-甲基甲酰胺中回流时,一系列烷基和芳基环丙基羰基化合物得到不同取代的吡咯烷。
Nickel-Catalyzed Regioselective Reductive Ring Opening of Aryl Cyclopropyl Ketones with Alkyl Bromides
作者:Bing Yuan、Decai Ding、Chuan Wang
DOI:10.1021/acscatal.2c00677
日期:2022.4.15
Herein, we report the successful implementation of reductive strategy in the ring opening reaction of aryl cyclopropyl ketones with unactivated alkyl bromides. Under the catalysis of nickel, this reductive Csp3–Csp3 cross-coupling reaction proceeds with complete regioselectivity and bypasses the use of pregenerated organometallics, enabling efficient synthesis of alkylated ketones with high step economy
β-unsaturated ketones could be obtained by palladium-catalyzed ring-opening of mono-substituted cyclopropyl ketones efficiently and systematically. (E)-1-Arylbut-2-en-1-ones were generated from aryl cyclopropyl ketones stereoselectively in yields of 23–89% by the Pd(OAc)2/PCy3 catalytic system. The reaction exhibited stereoselectivity (only E products were found) and was suitable for both phenyl and
在此,我们报道通过钯催化的单取代环丙基酮的开环可以有效且系统地获得α,β-不饱和酮。( E )-1-Arylbut-2-en-1-ones 通过 Pd(OAc) 2 /PCy 3催化体系由芳基环丙基酮立体选择性生成,收率为 23-89% 。该反应表现出立体选择性(仅发现E产物)并且适用于苯基和杂芳基环丙基酮。
Iron-Catalyzed Reductive Ring Opening/<i>gem</i>-Difluoroallylation of Cyclopropyl Ketones
作者:Bing Yuan、Chang Zhang、Haiyan Dong、Chuan Wang
DOI:10.1021/acs.orglett.3c00398
日期:2023.3.24
By merging C–C and C–F bond cleavage, we developed a regioselective ring opening/gem-difluoroallylation of cyclopropyl ketones with α-trifluoromethylstyrenes, which proceeds under the catalysis of iron with the combination of manganese and TMSCl as the reducing agents, providing a new entry to the synthesis of carbonyl-containing gem-difluoroalkenes. Remarkably, the ketyl radical-induced selective