Stereoselective synthesis and fungicidal activities of (E)-α-(methoxyimino)-benzeneacetate derivatives containing 1,3,4-oxadiazole ring
作者:Yan Li、Jie Liu、Hongquan Zhang、Xiangping Yang、Zhaojie Liu
DOI:10.1016/j.bmcl.2006.01.026
日期:2006.4
Fifteen novel (E)-alpha-(methoxyimino)-benzeneacetate derivatives, the analogues of strobilurins, which contain two pharmacophoric substructures of (E)-methyl methoxyiminoacetate moiety and 1,3,4-oxadiazole ring were stereoselectively synthesized. It was first found that the coupling reaction could give stereoselectively the key intermediate (E) and (Z)-methyl 2-(hydroxyimino)-2-o-tolylacetate 2 with
Thermal decomposition of alkyl peresters in hydrogen donor solvents (cycloalcanes or ethers) in the presence of aldoximes affords (C-l)-alkylated products. The reaction is favored by electron-withdrawing substituents on the oxime and involves free C-radical addition to the imine moiety.
The palladium or iridium-catalyzed O-allylic substitution of oximes provides a new method for direct preparation of the O-allylated oxime ethers from oximes.
钯或铱催化的肟的O-烯丙基取代为由肟直接制备O-烯丙基化肟醚提供了一种新方法。
New method of in situ generation of nitrile oxides by MnO2 oxidation of aldoximes
Manganese(IV) oxide (MnO2) was found to oxidize aldoximes to nitrileoxides. Nitrileoxides were trapped in situ with dipolarophiles to furnish 2-oxazolines. The best results were obtained with hydroximinoacetates as nitrileoxide precursors.
Synthesis and N-functionalization of isoxazolidines: a new approach to nucleoside analogues
作者:Carlos A.D. Sousa、José E. Rodríguez-Borges、Xerardo Garcia-Mera
DOI:10.1016/j.tetlet.2014.06.076
日期:2014.8
preparation of non N-functionalized isoxazolidines from BF3-catalyzed 1,3-cycloaddition reactions between methyl glyoxylate oxime and alkenes is described. Subsequently, isoxazolidines were N-functionalized with three chemically active groups (2-chloroethyl, cyanomethyl and 2-acetoxyethyl), thus allowing the preparation of a wide array of N-functionalized isoxazolidines. The compounds were characterized
描述了由乙醛酸甲酯肟和烯烃之间的BF 3催化的1,3-环加成反应制备非N-官能化异恶唑烷的直接合成方法。随后,用三个化学活性基团(2-氯乙基,氰基甲基和2-乙酰氧基乙基)对异恶唑烷进行N-官能化,从而可以制备各种各样的N-官能化的异恶唑烷。借助于1 H和13 C NMR光谱法和质谱对化合物进行表征。X射线分析用于立体化学阐明。