The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
Satayendra P Bhatnagar - One of the best experts on this subject based on the ideXlab platform.
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efficient Niementowski Synthesis of novel derivatives of 1 2 9 11 tetrasubstituted 7h thieno 2 3 4 5 pyrimido 6 1 b quinazolin 7 one
Proceedings of The 11th International Electronic Conference on Synthetic Organic Chemistry, 2007Co-Authors: Sachin S Laddha, Satayendra P BhatnagarAbstract:Starting Starting from 5,6-disubstituted-3H-thieno[2,3-d]pyrimidin-4-ones, novel 1,2,9,11-tetrasubstituted-7H-thieno[2',3':4,5]pyrimido[6,1-b]quinazolin-7-ones could be reached in two steps through a von Niementowski reaction, which involves condensation of substituted anthranilic acids with a 4-chloro-5,6-disubstituted-3H-thieno[2,3-d] pyrimidines. Microwave irradiation in acetic acid media was used in order to improve reactions where conventional heating was limited.
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efficient Niementowski Synthesis of novel 1 3 10 12 tetra substituted 8h pyrido 2 3 4 5 pyrimido 6 1 b quinazolin 8 ones
Arkivoc, 2007Co-Authors: Sachin S Laddha, Satayendra P BhatnagarAbstract:Novel 1,3,10,12-tetrasubstituted-8H-pyrido(2',3':4,5)pyrimido(6,1-b)quinazolin-8-ones were Synthesised by a Niementowski reaction involving condensation of substituted anthranilic acids with a 5,7-disubstituted-3H-pyrido(2,3-d)pyrimidin-4-ones. Microwave irradiation in polyphosphoric acid media was used in order to improve reactions where classical or direct fusion method was limited. The Synthesis of title compounds highlights a comparative study of the classical, microwave technique and direct fusion methods.
Sachin S Laddha - One of the best experts on this subject based on the ideXlab platform.
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efficient Niementowski Synthesis of novel derivatives of 1 2 9 11 tetrasubstituted 7h thieno 2 3 4 5 pyrimido 6 1 b quinazolin 7 one
Proceedings of The 11th International Electronic Conference on Synthetic Organic Chemistry, 2007Co-Authors: Sachin S Laddha, Satayendra P BhatnagarAbstract:Starting Starting from 5,6-disubstituted-3H-thieno[2,3-d]pyrimidin-4-ones, novel 1,2,9,11-tetrasubstituted-7H-thieno[2',3':4,5]pyrimido[6,1-b]quinazolin-7-ones could be reached in two steps through a von Niementowski reaction, which involves condensation of substituted anthranilic acids with a 4-chloro-5,6-disubstituted-3H-thieno[2,3-d] pyrimidines. Microwave irradiation in acetic acid media was used in order to improve reactions where conventional heating was limited.
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efficient Niementowski Synthesis of novel 1 3 10 12 tetra substituted 8h pyrido 2 3 4 5 pyrimido 6 1 b quinazolin 8 ones
Arkivoc, 2007Co-Authors: Sachin S Laddha, Satayendra P BhatnagarAbstract:Novel 1,3,10,12-tetrasubstituted-8H-pyrido(2',3':4,5)pyrimido(6,1-b)quinazolin-8-ones were Synthesised by a Niementowski reaction involving condensation of substituted anthranilic acids with a 5,7-disubstituted-3H-pyrido(2,3-d)pyrimidin-4-ones. Microwave irradiation in polyphosphoric acid media was used in order to improve reactions where classical or direct fusion method was limited. The Synthesis of title compounds highlights a comparative study of the classical, microwave technique and direct fusion methods.
Thierry Besson - One of the best experts on this subject based on the ideXlab platform.
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efficient modified von Niementowski Synthesis of novel derivatives of 5a 14b 15 triazabenzo a indeno 1 2 c anthracen 5 one from indolo 1 2 c quinazoline
Tetrahedron Letters, 2001Co-Authors: Lisianne Domon, Catherine Le Coeur, Axelle Grelard, Valerie Thiery, Thierry BessonAbstract:Abstract Starting from 2-(2-aminophenyl)indole novel triazabenzo[ a ]indeno[1,2- c ]anthracen-5-ones could be reached in three steps through a modified von Niementowski reaction, which involves condensation of anthranilic acids with an S -alkylated 6-mercaptoindolo[1,2- c ]quinazoline. Microwave irradiation in dry media was used in order to improve reactions where conventional heating was limited.
Lisianne Domon - One of the best experts on this subject based on the ideXlab platform.
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efficient modified von Niementowski Synthesis of novel derivatives of 5a 14b 15 triazabenzo a indeno 1 2 c anthracen 5 one from indolo 1 2 c quinazoline
Tetrahedron Letters, 2001Co-Authors: Lisianne Domon, Catherine Le Coeur, Axelle Grelard, Valerie Thiery, Thierry BessonAbstract:Abstract Starting from 2-(2-aminophenyl)indole novel triazabenzo[ a ]indeno[1,2- c ]anthracen-5-ones could be reached in three steps through a modified von Niementowski reaction, which involves condensation of anthranilic acids with an S -alkylated 6-mercaptoindolo[1,2- c ]quinazoline. Microwave irradiation in dry media was used in order to improve reactions where conventional heating was limited.
K V Srinivasan - One of the best experts on this subject based on the ideXlab platform.
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the synergy of combined use of dmso and bronsted acid ionic liquid as a catalyst part i efficient Niementowski Synthesis of modified quinazolinones
Green and Sustainable Chemistry, 2011Co-Authors: Muthu K Kathiravan, Rajeshwar R Jalnapurkar, Trupti S Chitre, Riyaj S Tamboli, K V SrinivasanAbstract:A new rapid and versatile approach using Ionic liquid/DMSO as a chemical reagent for the Synthesis of fused heterocyclic compounds in a highly efficient way is described. This method offers the advantages of proceeding in neutral conditions, giving high to excellent isolated yields (83–92%) for Niementowski Synthesis with easy workup procedure. The inherent Bronsted acidity of ionic liquid and high polarity of both IL and DMSO resulted in a significant enhancement in the reaction rate.