A FACILE METHOD FOR THE CONVERSION OF OXIMES AND TOSYLHYDRAZONES TO CARBONYL COMPOUNDS WITH CR-MCM-41 ZEOLITE UNDER MICROWAVE IRRADIATION*
摘要:
Cr-MCM-41 zeolite supported on silica gel can be used as an effective and mild oxidizing agent for the direct conversion of oximes and tosylhydrazones to carbonyl compounds under microwave irradiation in good yield. The procedure is applicable to the variety of oximes and tosylhydrazones and the zeolite can be recycled.
In this study, sulfones are synthesized from sulfonylhydrazones catalyzed by iron(III) phthalocyanine chloride. This reaction offers broad substrate scope, occurs under mild conditions, utilized readily available reactants, and forms products in good-to-high yields. Crossover experiments reveal that the reaction occurs via an intramolecular process, which is possibly different from other studies reported
Efficient Synthesis of 1,5-Disubstituted Carbohydrazones Using K<sub>2</sub>CO<sub>3</sub> As a Carbonyl Donor
作者:Jun Wen、Chu-Ting Yang、Tao Jiang、Sheng Hu、Tong-Zai Yang、Xiao-Lin Wang
DOI:10.1021/ol500732c
日期:2014.5.2
A novel reaction that generates 1,5-disubstituted carbohydrazones via the carbonylation of tosylhydrazones has been developed. For the first time, the inexpensive, readily available, environmentally friendly, and nongaseous potassium carbonate is used as the carbonyl donor for the transformation. The reaction system exhibited tolerance with various functional groups and affords the desired products
KI/TBHP-promoted [3 + 2] cycloaddition of pyrrolo[1,2-<i>a</i>]quinoxalines and <i>N</i>-arylsulfonylhydrazones
作者:Zhen Yang、Jing He、Yueting Wei、Weiwei Li、Ping Liu
DOI:10.1039/d0ob00494d
日期:——
An efficient KI/TBHP-promoted [3 + 2] cycloaddition of pyrrolo[1,2-a]quinoxalines and N-tosylhydrazones is described. A series of diverse fused [1,2,4]triazolo[3,4-c]quinoxalines was obtained in moderate to good yields with wide functional group tolerance. Importantly, this reaction can be performed on a gram scale, even in a one-pot fashion. In addition, further transformations of the products were
CuI-Catalyzed Selective 3-Alkylation of Indoles with <i>N</i>
-Tosylhydrazones and the I<sub>2</sub>
-Mediated Further Cyclization to Chromeno[2,3-<i>b</i>
]Indoles
作者:Chun-Bao Miao、Yan-Fang Sun、He Wu、Xiao-Qiang Sun、Hai-Tao Yang
DOI:10.1002/adsc.201800206
日期:2018.7.4
The CuI‐catalyzed reaction of indoles with N‐tosylhydrazones derived from the ortho‐/para‐hydroxybenzaldhydes affords selectively the C‐3 alkylated products rather than the N‐alkylated products. In addition, the I2‐mediated cyclization of the generated C‐3 alkylated products allows the concise synthesis of chromeno[2,3‐b]indole derivatives.
吲哚与碘化亚铜催化反应Ñ -tosylhydrazones从派生邻- /对-hydroxybenzaldhydes得到选择性地将Ç -3烷基化产物,而不是Ñ烷基化产品。此外,生成的C-3烷基化产物的I 2介导的环化反应可简化chromeno [2,3- b ]吲哚衍生物的合成。
Synthesis of Diarylmethanes via Metal-Free Reductive Cross-Coupling of Diarylborinic Acids with Tosyl Hydrazones
作者:Xijing Li、Yuanyuan Feng、Lin Lin、Gang Zou
DOI:10.1021/jo302207b
日期:2012.12.7
that takes advantage of diarylborinic acids as a cost-effective alternative to arylboronicacids for synthesis of diarylmethanes through metal-free reductive cross-coupling with N-tosylhydrazones of aromatic aldehydes and ketones. The procedure tolerates hydroxyl, halide, amine, and allyl functionality, complementary to the transition-metal catalyzed cross-coupling techniques.