Domino C-H Sulfonylation and Pyrazole Annulation for Fully Substituted Pyrazole Synthesis in Water Using Hydrophilic Enaminones
作者:Yanhui Guo、Guodong Wang、Li Wei、Jie-Ping Wan
DOI:10.1021/acs.joc.8b02897
日期:2019.3.1
NH2-functionalized enaminones and sulfonyl hydrazines have been developed for the synthesis of fully substituted pyrazoles. By making use of the hydrophilic primary amino group in the enaminones, the reactions proceed well in the medium of pure water in the presence of molecular iodine, TBHP, and NaHCO3 via cascade C-H sulfonylation and pyrazole annulation. The cleavage of the C–N bond in enaminones is confirmed
A Chiral Pool Strategy for the Synthesis of Enantiopure Hydroxymethyl-Substituted Pyridine Derivatives
作者:Christian Eidamshaus、Hans-Ulrich Reissig
DOI:10.1002/ejoc.201100681
日期:2011.10
A simple procedure for the synthesis of enantiopure hydroxymethyl-substituted pyridine derivatives is presented. The developed method is based on TMSOTf-promoted cyclocondensations of β-ketoenamides, leading to differently substituted 4-hydroxypyridine/4-pyridone derivatives. The required β-ketoenamides were prepared by acylation ofeasily available enamino ketones with suitably protected enantiopure
A series of di substitutedindole and tri substituted pyrrole derivatives were synthesized efficiently by using I2/K2CO3 in DMSO. The novel synthesis method offers the advantage of mild reaction conditions, operational simplicity, higher yields. The method is functional group tolerant and provides quick access to medicinally significant compounds in moderate to high yields.
通过在DMSO中使用I 2 / K 2 CO 3有效合成了一系列二取代的吲哚和三取代的吡咯衍生物。新颖的合成方法具有反应条件温和,操作简单,产率高的优点。该方法具有官能团耐受性,可以以中等到高产率快速获得具有医学意义的化合物。
Microwave-assisted facile synthesis of trisubstituted pyrrole derivatives
作者:V. Hanuman Reddy、G. Mallikarjuna Reddy、M. Thirupalu Reddy、Y. V. Rami Reddy
DOI:10.1007/s11164-015-1966-9
日期:2015.12
We report efficient synthesis of pyrrole derivatives by use of microwave irradiation. Quantitative yields were obtained in short reaction times. Low yields of product were obtained from alicyclic amino unsaturated ketone derivatives; higher yields were obtained from aliphatic amino unsaturated ketone derivatives.
[EN] THIN FILM-FORMING MATERIAL, THIN FILM, AND THIN FILM PRODUCING METHOD<br/>[FR] MATÉRIAU DE FORMATION DE FILM MINCE, FILM MINCE ET PROCÉDÉ DE PRODUCTION DE FILM MINCE<br/>[JA] 薄膜形成用原料、薄膜及び薄膜の製造方法