Synthesen mit Nitrilen, 88. Mitt.: Spiro[indol- und Spiro[inden-pyrano[2,3-c]pyrazole]aus Cyanmethylenderivaten und Pyrazolonen
摘要:
The reactivity of cyanomethylene-indolones (1 a-e) and 2-(dicyanomethylene)-indan-1,3-dione (4) towards, 1,5-disubstituted 3-pyrazolones (2 a-c) was investigated. The reactions yield spiro[indene- and spiro[indole-4'- and 6'-pyrano[2,3-c]pyrazoles] (3 a-e, 5 a-c). The structures are proven by C-13-NMR-spectroscopy. The mechanisms of the reactions are discussed.
N-Sulfonic acid modified poly(styrene-co-maleic anhydride): an efficient and recyclable solid acid catalyst for the synthesis of a wide range of spiropyrans
作者:Majid M. Heravi、Elaheh Hashemi、Fereshteh Azimian
DOI:10.1007/s13738-014-0523-6
日期:2015.4
N-Sulfonic acid modified poly(styrene-co-maleic anhydride) as a recyclable solid acid catalyst efficiently catalyzed the one-pot three-component synthesis of spiropyran derivatives through a simple, convenient, and cost-effective approach in good yields and selectivity. .
Preparation and characterization of a novel organic–inorganic hybrid nanostructure: application in synthesis of spirocompounds
作者:Najmieh Ahadi、Mohammad Ali Bodaghifard、Akbar Mobinikhaledi
DOI:10.1007/s11164-020-04130-x
日期:2020.7
The spirocompounds, especially spiroperimidines and pyranopyrazoles, are important structures with diverse biologicalactivities and many applications in industries. So, the prepared hybrid nanomaterial was used as an efficient catalyst in the one-pot, green and simple protocol for the synthesis of pyranopyrazole, spiropyranopyrazole and spiroperimidine derivatives. The structure of some compounds is
Highly Convergent One-Pot Four-Component Regioselective Synthesis of Spiro-pyranopyrazoles and Oxa-aza-[3.3.3]propellanes
作者:Abdolali Alizadeh、Fahimeh Bayat
DOI:10.1002/hlca.201300260
日期:2014.5
A concise and efficient route for the synthesis of spiro‐pyranopyrazoles and oxa‐aza‐[3.3.3]propellanes by simple regioselective multicomponent reaction of ninhydrin, malononitrile, hydrazine derivatives, and β‐keto esters or dimethyl acetylenedicarboxylate was developed. This protocol provides an alternative method for combinatorial and parallel syntheses in drug discovery. The value of this method
Synthesen mit Nitrilen, 88. Mitt.: Spiro[indol- und Spiro[inden-pyrano[2,3-c]pyrazole]aus Cyanmethylenderivaten und Pyrazolonen
作者:Renate Dworczak
DOI:10.1007/bf00811473
日期:——
The reactivity of cyanomethylene-indolones (1 a-e) and 2-(dicyanomethylene)-indan-1,3-dione (4) towards, 1,5-disubstituted 3-pyrazolones (2 a-c) was investigated. The reactions yield spiro[indene- and spiro[indole-4'- and 6'-pyrano[2,3-c]pyrazoles] (3 a-e, 5 a-c). The structures are proven by C-13-NMR-spectroscopy. The mechanisms of the reactions are discussed.