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Ammonium Metavanadate: A Mild and Efficient Catalyst for the Synthesis of Coumarins
Mandhane, Priyanka G.,Joshi, Ratnadeep S.,Ghawalkar, Anant R.,Jadhav, Ganesh R.,Gill, Charansingh H. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
A mild and efficient method has been developed for condensation of substituted phenol with ${\beta}$-ketoester in the presence of catalytic amount of ammonium metavanadate (10 mol%) at ambient temperature to afford the corresponding substituted 4-methyl-2H-chromen-2-one in high yields under mild conditions. Utilization of commercially available inexpensive catalyst makes this manipulation very interesting from an economic perspective.
Mandhane, Priyanka G.,Joshi, Ratnadeep S.,Khan, Wajid,Gill, Charansingh H. Korean Chemical Society 2011 대한화학회지 Vol.55 No.4
5-(3,4,5-Triethoxyphenyl)-1,3,4-oxadiazole-2-thiol 6 on treatment with substituted 3-(bromomethyl)-2-chloroquinoline or 2-(p-tolyloxy)-3-(bromomethyl)quinoline 4a-j afforded the corresponding 3-((5-(3,4,5-triethoxyphenyl)-1,3,4-oxadiazol-2-ylthio)methyl)-2-chloroquinoline or 3-((5-(3,4,5-triethoxyphenyl)-1,3,4-oxadiazol-2-ylthio)methyl)-2-(p-tolyloxy)quinoline 7a-j, in the presence of $K_2CO_3$ and DMF under stirring at ambient temperature. All the synthesized compounds were further screened for their antibacterial activities. Some of our compounds showed excellent antibacterial activities against test organisms and reference standard. 5-(3,4,5-Triethoxyphenyl)-1,3,4-oxadiazole-2-thiol 6을 3-(bromomethyl)-2-chloroquinoline or 2-(p-tolyloxy)-3-(bromomethyl) quinoline 4a-j 화합물과 반응시켜서 3-((5-(3,4,5-triethoxyphenyl)-1,3,4-oxadiazol-2-ylthio)methyl)-2-chloroquinoline 또는 3-((5-(3,4,5-triethoxyphenyl)-1,3,4-oxadiazol-2-ylthio)methyl)-2-(p-tolyloxy)quinoline 7a-j를 합성하였다. 합성한 화합물들에 대한 항균활성을 측정하였으며, 화합물 7d, 7i 및 7j 은 우수한 활성을 나타내었다.
Ammonium Metavanadate: A Mild and Efficient Catalyst for the Synthesis of Coumarins
Priyanka G. Mandhane,Ratnadeep S. Joshi,Anant R. Ghawalkar,Ganesh R. Jadhav,Charansingh H. Gill 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
A mild and efficient method has been developed for condensation of substituted phenol with β-ketoester in the presence of catalytic amount of ammonium metavanadate (10 mol%) at ambient temperature to afford the corresponding substituted 4-methyl-2H-chromen-2-one in high yields under mild conditions. Utilization of commercially available inexpensive catalyst makes this manipulation very interesting from an economic perspective.
Joshi, Ratnadeep S.,Mandhane, Priyanka G.,Chate, Asha V.,Gill, Charansingh H. Korean Chemical Society 2011 대한화학회지 Vol.55 No.5
A new series of 1-(5-(2-tolyloxyquinoline-3-yl)-2-(pyridine-4-yl)-1,3,4-oxidiazol-3(2H)-yl)ethanones were synthesized from cyclisation of N'-((2-(p-tolyloxy)quinoline-3-yl)methylene) isonitonohydrazide in acetic unhydride at reflux condition for 3-4 hr. The structures of the new compounds were confirmed by elemental analyses as well as IR, 1H NMR and mass spectral data. All the synthesized compounds were screened for their antibacterial activities against various bacterial strains. Several of these compounds showed potential antibacterial activity.
Joshi, Ratnadeep S.,Mandhane, Priyanka G.,Chate, Asha V.,Khan, Wajid,Gill, Charansingh H. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
A convenient synthesis of substituted [1,2,4]-triazolo [1',2':1,2]pyrimido[6,5-b]-quinoline 4(a-i) from substituted 2-chloroquinoline-3-carbaldehyde 1(a-i) and 4H-1,2,4-triazol-3-amine 2 by using $SiO_2/K_2CO_3$ under microwave irradiation. This method affords the [1,2,4]-Triazolo [1',2':1,2]pyrimido[6,5-b]-quinoline 4(a-i) under the influence of microwave irradiation in solvent-free conditions within short span (12 - 20 min), & gaves excellent yields (89 - 95%). All the synthesized compounds were further screened for their antibacterial activities. Some of our compounds showed excellent antibacterial activities against control drugs.
An Improved Procedure for the Synthesis of 1,5-Benzothiazepines Using Ceric Ammonium Nitrate (CAN)
Chate, Asha V.,Joshi, Ratnadeep S.,Mandhane, Priyanka G.,Gill, Charansingh H. Korean Chemical Society 2011 대한화학회지 Vol.55 No.5
A mild and efficient procedure for the synthesis of various 1,5-benzothiazepines were developed. This method provides an easy access for preparation of 1,5-benzothiazepine derivatives in the presence of 10 mol% catalyst of CAN under ultrasonic irradiation. This method provided clean conversion, mild reaction condition, no use of toxic solvent and shorter reaction time compared to other reported method.
Ratnadeep S. Joshi,Priyanka G. Mandhane,Asha V. Chate,Wajid Khan,Charansingh H. Gill 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
A convenient synthesis of substituted [1,2,4]-triazolo [1’,2’:1,2]pyrimido[6,5-b]-quinoline 4(a-i) from substituted 2-chloroquinoline-3-carbaldehyde 1(a-i) and 4H-1,2,4-triazol-3-amine 2 by using SiO2/K2CO3 under microwave irradiation. This method affords the [1,2,4]-Triazolo [1’,2’:1,2]pyrimido[6,5-b]-quinoline 4(a-i) under the influence of microwave irradiation in solvent-free conditions within short span (12 - 20 min), & gaves excellent yields (89 -95%). All the synthesized compounds were further screened for their antibacterial activities. Some of our compounds showed excellent antibacterial activities against control drugs.