Design, Synthesis, and Synergistic Activity of Eight-Membered Oxabridge Neonicotinoid Analogues
作者:Xiao Zhang、Yiping Wang、Zhiping Xu、Xusheng Shao、Zewen Liu、Xiaoyong Xu、Peter Maienfisch、Zhong Li
DOI:10.1021/acs.jafc.0c04786
日期:2021.3.17
cis-configuration neonicotinoid (IPPA08) exhibited specific synergistic activity toward neonicotinoid insecticides. In this study, we synthesized a series of structural analogues of IPPA08 by converting the pyridyl moiety of IPPA08 into phenyl groups, via facile double-Mannich condensation reactions between nitromethylenecompounds and glutaraldehyde. All of the oxabridged neonicotinoidcompounds were found
Synthesis, crystal structure, and biological evaluation of a novel eight-membered dinitration neonicotinoid analogues
作者:Xiao Zhang、Weiwei Yu、Xiaoyong Xu、Xusheng Shao、Zhong Li
DOI:10.1016/j.bmcl.2021.127960
日期:2021.7
intermediate synthesis, a serendipitous reaction of introducing nitro group from nitromethylene has been observed. Instead of expected dihydroxy compounds, dinitration structures with nitromethylene analogues were prepared under mild conditions by using a metal-free catalyst B(OH)3. In this reaction, the extra nitro group was suggested to be from starting material. Bioassays indicated that compound 3a showed
Synthesis of bicyclic 2-pyridones by regioselective annulations of heterocyclic ketene aminals with anhydrides
作者:Jin Liu、Sheng-Jiao Yan、Zheng-Mao Cao、Shi-Sheng Cui、Jun Lin
DOI:10.1039/c6ra23451h
日期:——
An efficient strategy for the synthesis of substituted bicyclic 2-pyridones is developed. The proposed approach is based on the regioselective N-acylation of heterocyclic ketene aminals (HKAs) with methacrylic anhydride or crotonic anhydride. The tolerance of the developed methodology allows for the construction of fused 2-pyridone ring systems in excellent yields with a variety of functional groups