Rhodium ion catalyzed decomposition of aryldiazoalkanes
作者:B.K.Ravi Shankar、Harold Shechter
DOI:10.1016/s0040-4039(00)87320-7
日期:1982.1
Aryldiazomethanes are converted by rhodium(II) acetate and iodorhodium(III) tetraphenylporphyrin to cis- rather than trans-1,2-diarylethylenes. Secondary aryldiazoalkanes react with rhodirum(II) acetate to give azines.
Base mediated 1,3-dipolar cycloaddition of α-substituted vinyl phosphonates with diazo compounds for synthesis of 3-pyrazolylphosphonates and 5-pyrazolcarboxylates
作者:Nataliya S. Goulioukina、Nikolay N. Makukhin、Egor D. Shinkarev、Yuri K. Grishin、Vitaly A. Roznyatovsky、Irina P. Beletskaya
DOI:10.1039/c6ob01780k
日期:——
5-Aryl-substituted pyrazol-3-ylphosphonates have been conveniently synthesized by 1,3-dipolar cycloaddition of 1-formamidovinylphosphonates and aryldiazomethanes under K2CO3/MeOH conditions at room temperature. These pyrazoles are formed in one pot via spontaneous elimination of formamide. Basic conditions prevent competitive formation of cyclopropylphosphonates. 3-Aryl substituted pyrazol-5-carboxylates
通过在室温下在K 2 CO 3 / MeOH条件下将1-甲酰胺基乙烯基膦酸酯和芳基重氮甲烷进行1,3-偶极环加成,可以方便地合成5-芳基取代的吡唑-3-基膦酸酯。这些吡唑是通过自发消除甲酰胺而在一锅中形成的。碱性条件阻止竞争性形成环丙基膦酸酯。3-芳基取代的吡唑-5-羧酸酯可以通过相同的方法由1-芳基乙烯基膦酸酯和重氮乙酸乙酯合成,尽管为了确保芳构化阶段成功且消除二乙氧基磷酰基部分是必需的,更强的碱NaH是必需的。
ZEOLITE-CuNaY CATALYZED DECOMPOSITION OF ARYLDIAZOMETHANE
作者:Makoto Onaka、Hiroshi Kita、Yusuke Izumi
DOI:10.1246/cl.1985.1895
日期:1985.12.5
Decomposition of aryldiazomethanes is catalyzed by copper ion-exchanged Y-type zeolite to afford cis-1,2-diarylethylenes in high selectivity. The catalytic activity and selectivity are found to be affected by the exchange level of copper ions in zeolite and the solvent used.