The lead tetraacetate oxidation of aldoximes at low temperature has benn studied. Oxidation of aliphatic and aromatic syn-aldoximes affords nitrile oxides. Aliphatic anti-aldoximes lead to dimeric 1-acetoxy-1-nitroso-alkanes and secondary products. Aromatic anti-aldoximes afford arylaldazine-bis-N-oxides which decompose on heating to nitrile oxides and aldoximes. Mechanisms are proposed which require
已经研究了在低温下醛肟的四乙酸铅氧化。脂族和芳族合成醛肟的氧化提供了腈氧化物。脂肪族抗醛肟导致二聚的1-乙酰氧基-1-亚硝基-烷烃和副产物。芳族抗醛肟类化合物提供芳基aldazine - bis -N-氧化物,该化合物在加热时分解为腈氧化物和醛肟类。被提出的机制需要亚氨氧基自由基如在氧化的中间体反-aldoximes,而氧化顺-aldoximes出现协调一致地进行。
Asymmetric Organocatalytic β-Hydroxylation of α,β-Unsaturated Aldehydes
The first catalytic enantioselective β-hydroxylation of α,β-unsaturatedaldehydes is presented. Using commercially available (E)-benzaldehyde oxime in the presence of 2-[bis(3,5-bis-trifluoromethyl-phenyl)trimethyl-silanyloxymethyl]pyrrolidine as organocatalyst, the corresponding chiral carbonyl β-oxime ethers are obtained in high yields and with excellent enantioselectivities. These optically active
Amine-promoted cyclocondensation of highly substituted aromatic nitrile oxides with diketones
作者:Jeffrey W Bode、Yoshifumi Hachisu、Tomoo Matsuura、Keisuke Suzuki
DOI:10.1016/s0040-4039(03)00614-2
日期:2003.4
Base-promoted cyclocondensation of hindered nitrileoxides and cyclic diketones affords highly functionalized, sterically-encumbered isoxazole products in good yield. The mild reaction conditions (NEt3, EtOH) are tolerant to a wide variety of functionality and permit the preparation of precursors to complex polycycles typically inaccessible via direct, intermolecular carboncarbon bond forming reactions
Mechanochemical Dimerization of Aldoximes to Furoxans
作者:Run-Kai Fang、Kuan Chen、Chuang Niu、Guan-Wu Wang
DOI:10.3390/molecules27082604
日期:——
environmentally friendly and cost-effective technology that is now widely used in the field of organic synthesis. The mechanochemical solvent-free synthesis of furoxans from aldoximes was achieved through dimerization of the in situ generated nitrile oxides in the presence of sodium chloride, Oxone and a base. A variety of furoxans was obtained with up to a 92% yield. The present protocol has the advantages of
Synthesis, crystal structure and fungicidal activities of 3-(Trifluoromethyl)-Pyrazole-4-carboxylic oxime ester derivatives
作者:Meng-Meng Yao、Wei-Ting Chen、Li-Jing Min、Liang Han、Na-Bo Sun、Xing-Hai Liu
DOI:10.1016/j.molstruc.2022.133405
日期:2022.10
pyrazole-4-carboxylic oxime ester derivatives were synthesized from benzaldehyde oxime and 3-(trifluoromethyl)-1-methyl-1H-pyrazole-4-carbonyl chloride conveniently. These pyrazole-4-carboxylic oxime ester structures were confirmed by 1H NMR and HRMS. The compound 5f was further confirmed by X-ray diffraction. They crystallized in the monoclinic system, space group C2/c, Z = 8. The fungicidalactivity results indicated
以苯甲醛肟和3-(三氟甲基)-1-甲基-1H-吡唑-4-碳酰氯为原料合成了15种新型吡唑-4-羧肟酯衍生物。这些吡唑-4-羧酸肟酯结构通过1 H NMR 和HRMS 证实。通过X射线衍射进一步证实了化合物5f 。它们在单斜晶系中结晶,空间群C2/c,Z = 8。杀菌活性结果表明,其中一些化合物对核盘菌、灰霉病菌、茄病菌、稻瘟病菌和青霉病菌具有良好的活性。在 50 ppm。此外,通过分子对接模拟研究了构效关系。