2-甲基-3-(4-对甲氧基苯基)-5-(3-甲氧基苯基)异噁唑啉及其生物活性

采用1,3-偶极环加成反应合成了2-甲基-3-对甲氧基苯基-5-间甲氧基苯基异噁唑啉,分离了顺、反异构体,采用核磁共振氢谱分析表征了顺反异构体的谱图行为,对异构体的生物活性进行了测定,新杀菌剂2-甲基-3-对甲氧基苯基-5-间甲氧基苯基异噁唑啉对病菌的有效成分为反式结构,顺式体为无效成分.     

Optimized Synthesis of Tetrakis(4-methoxyphenyl)porphin–Co(II)

Detailed kinetic investigation of Rothemund synthesis of porphyrins was conducted in different solvents. A one-pot synthesis of tetrakis(4-methoxyphenyl)porphin–Co(II) from pyrrole, anisic aldehyde, and cobalt acetate was developed that gave 35% isolated yield. Chlorobenzene was found to be the best solvent for the reaction. The synthesis can be done with either propionic or chloroacetic acid as catalyst with about the same yield. Cobalt prevents the synthesis of the porphyrin, so it has to be added in the reaction mixture only after the synthesis of the free porphyrin is finished. Optimum time is 2–2.5 h at a temperature of 130°C. Lower temperatures reduce the yield. Potentially, these dependencies can be applied to synthesis of other analogous porphyrins.     

Stoichiometry-dependent oxidation of tris(2-methoxyphenyl)antimony with diiodine

The reaction of 2-methoxyphenyllithium with SbCl₃ affords tris(2-methoxyphenyl)antimony. Its treatment with equimolar amount of I₂ results in stiborane (2-MeOC₆H₄)₃SbI₂, while heating with 2 equivalents of I₂ leads to iodotris(2-methoxyphenyl)stibonium triiodide [(2-MeOC₆H₄)₃SbI]⁺ [I₃]^– featuring halogen bonding in solid state.     

1-(2,4二异丙氧基-5-甲氧苯基)乙酮的合成研究

本文设计一条新的合成路线,以价廉的异香兰素、间苯二酚为起始原料,通过Dakin反应、乙酰化、酚羟基醚化等系列反应得到目标化合物1-(2,4二异丙基氧基苯基)乙酮(5b)和新化合物1-(2,4二异丙基氧基-5-甲氧基苯基)乙酮(5a)。通过对化合物(5a)进行条件因素探索,得出合成(5a)的最佳反应条件,并通过1H NMR、MS、熔点等技术手段对其进行结构的确认与表征。     

S,S-Alkyl S′-alkyl(4-methoxyphenyl)phosphonotrithiolothionates

A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Science Center, Russian Academy of Sciences, 420083 Kazan. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 8, pp. 1932–1933, August, 1992.