A simple, regioselective, convenient, and base mediated synthesis of (2E,4E)-5-aryl-6-oxo-6-phenyl-3-sec.amino-hexa-2,4-dienenitriles has been achieved by the reaction of 6-aryl-4-sec.amino-2-oxo-2H-pyran-3-carbonitriles and benzyl cyanide. This reaction involves ring opening of the pyran ring at the C6 position by benzyl cyanide followed by decarboxylation and regioselective oxidative decyanation
A simple, efficient and economical synthesis of dimethyl 3-amino-5-(2-oxo-2-arylethyl)thiophene-2,4-dicarboxylates has been reported by ring opening of methyl 3-amino-6-aryl-4-oxo-4H-thieno[3,2-c]pyran-2-carboxylates by alkoxide ions.
Parmar, Virinder S.; Jain, Subhash C.; Jha, Amitabh, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1997, vol. 36, # 10, p. 872 - 879
作者:Parmar, Virinder S.、Jain, Subhash C.、Jha, Amitabh、Kumar, Naresh、Kumar, Ajay、Vats, Archana、Jha, Hriday N.、Mukherjee, Shubhasish、Singh, Sanjay K.、Jennings, Keith R.、Summerfield, Scott G.、Errington, William、Olsen, Carl E.
DOI:——
日期:——
Synthesis of E - and Z -Pyrazolylacrylonitriles and their evaluation as novel antioxidants
作者:Virinder S Parmar、Ajay Kumar、Ashok K Prasad、Sanjay K Singh、Naresh Kumar、Shubhasish Mukherjee、Hanumantharao G Raj、Sanjay Goel、William Errington、Mohindar S Puar
DOI:10.1016/s0968-0896(99)00056-5
日期:1999.7
A facile synthesis of (Z)- and (E)-2-(5-arylpyrazol-3-yl)-3-(pyrrol-2-yl)acrylonitriles and (Z)-2-(1,3-diarylpyrazol-5-yl)-3-(pyrrol-2-yl)acrylonitriles, and isomerisation of (Z)-2-(5-arylpyrazolyl)acrylonitriles to (E)-2-(5-arylpyrazolyl)acrylonitriles under basic conditions have been reported. (Z)-2-(1,3-Diarylpyrazolyl)acrylonitrile did not undergo isomerisation under the similar conditions. New compounds were identified on the basis of their spectral data (H-1-, C-13-, H-1-H-1 COSY, NOESY, NOE, HMQC NMR, IR, UV and EI mass). The structures of one acrylonitrile and five of their precursor 6-arylpyran-2-ones and cyanomethylpyrazoles were confirmed by X-ray crystallographic studies. Effects of pyrazolylacrylonitriles and their precursors on rat liver-microsomal lipid peroxidation were evaluated in vitro with a view to establish structure-activity relationship and to identify a lead compound. (C) 1999 Elsevier Science Ltd. All rights reserved.
Transition metal-free synthesis of sterically hindered allylarenes from 5-hexene-2-one
simple, efficient and transition metal-free strategy was established for the synthesis of highly functionalized, stericallyhindered allylarenes (6, 7 & 8) by base-mediated ring transformation of 2-oxo-6-aryl-4-(methylthio/sec-amino)-2H-pyran-3-carbonitriles (3/4) with 5-hexene-2-one (5). This provides a method for the synthesis of allylarenes functionalized with different electron donating and withdrawing