the presence of TMSCN and an alcohol additive are catalyzed by nucleophilicphosphines. The trisubstituted E-olefin products of anti-addition of hydrogen cyanide to the alkyne are produced with high regio- and stereoselectivity. The alcohol additive reacts with TMSCN to produce hydrogen cyanide in situ. Ynoic acids undergo the phosphine catalyzed hydrocyanation in the presence of TMSCN under aprotic
A convenient synthesis of pyrimidinone and pyrimidine containing bisheteroarenes and analogs
作者:Hardesh K. Maurya、Atul Gupta
DOI:10.1039/c4ra01689k
日期:——
The synthesis of pyrimidinone containing bisheteroarenes (3) and related analogs (9 and 10) by the reaction of active methylenes or substituted methyl acrylate with nitrogen containing precursors viz. amidines, or thiourea in water as well as other organic solvents was studied. Synthesized compounds have further been explored for the synthesis of diversified pyrimidines 4, 6–8, 11, 12 and 14 through
<i>aza</i>-Wittig Reaction with Nitriles: How Carbonyl Function Switches from Reacting to Activating
作者:Hamidulla B. Tukhtaev、Konstantin L. Ivanov、Stanislav I. Bezzubov、Dmitry A. Cheshkov、Mikhail Ya. Melnikov、Ekaterina M. Budynina
DOI:10.1021/acs.orglett.8b04135
日期:2019.2.15
ketone) in aza-Wittig reactions. To demonstrate the synthetic utility of the obtained iminophosphazenes as N,N-binucleophiles, their transformations into pyrrole-fused systems, pyrrolo[1,2-a]imidazoles and pyrrolo[1,2-a][1,3]diazepines, were carried out.
通过在磷腈和腈官能团之间发生不寻常的氮杂-维蒂希反应并提供吡咯衍生的亚氨基磷腈,进行了α-EWG取代(吸电子基团,EWG)γ-叠氮基丁腈的转化。发现α-EWGs控制化学选择性,并取决于其性质,在氮杂-Wittig反应中充当CN基团活化剂(例如,酯,酰胺或腈)或竞争剂(例如,酮)。为了证明所得亚氨基磷腈作为N,N-双亲核试剂的合成效用,将其转化为吡咯稠合体系,即吡咯并[1,2- a ]咪唑和吡咯并[1,2- a ] [1,3]二氮杂s。执行。
Tandem Knoevenagel-[3+2] cycloaddition-elimination reactions: one-pot synthesis of 4,5-disubstituted 1,2,3-(NH)-triazoles
found to catalyse Knoevenagelcondensation between aromatic aldehyde and cyano compound with active methylene hydrogens and this has led to a successful route for the onepotsynthesis of 4,5-disubstituted 1,2,3-(NH)-triazoles from aldehydes through Knoevenagel-[3+2]cycloaddition-elimination sequence. In the formation of 5-aryl-2H-1,2,3-triazole-4-carbonitrile derivatives, the reaction has been found
已发现叠氮化钠催化芳香醛和氰基化合物与活性亚甲基氢之间的Knoevenagel缩合反应,这已导致一锅法合成一锅法合成4,5-二取代1,2,3-(NH)-三唑的成功途径。通过Knoevenagel- [3 + 2]环加成-消除序列形成醛。在形成5-芳基-2 H -1,2,3-三唑-4-腈的衍生物中,发现该反应在水中有效地发生。
Knoevenagel condensation catalyzed by novel Nmm-based ionic liquids in water
A series of novel N-methyl morpholine (Nmm) based ionic liquids with 1,2-propanediol group were synthesized and used as catalysts for Knoevenagel condensation at roomtemperature in water. Under the effect of the catalyst, various aldehydes or aliphatic ketones could react with a wide range of activated methylene compounds well, including malononitrile, alkyl cyanoacetate, cyanoacetamide, β-diketone