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L-Proline as an Efficient Catalyst for the Synthesis of 2,4,5-Triaryl-1H-Imidazoles
Shitole, Nana V.,Shelke, Kiran F.,Sonar, Swapnil S.,Sadaphal, Sandip A.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.9
L-Proline has been found to be an efficient organocatalyst for one-pot synthesis of 2,4,5-triaryl substituted imidazole by the reaction of an aldehyde, a benzil and an ammonium acetate. The short reaction time and excellent yields making this protocol practical and economically attractive.
L-Proline as an Efficient Catalyst for the Synthesis of 2,4,5-Triaryl-1H-Imidazoles
Nana V. Shitole,Kiran F. Shelke,Swapnil S. Sonar,Sandip A. Sadaphal,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.9
L-Proline has been found to be an efficient organocatalyst for one-pot synthesis of 2,4,5-triaryl substituted imidazole by the reaction of an aldehyde, a benzil and an ammonium acetate. The short reaction time and excellent yields making this protocol practical and economically attractive.
In Vitro Propagation Through Nodal Explants in Helicteres isora L., a Medicinally Important Plant
M. G. Shitole,Varsha Shriram,Vinay Kumar 한국식물생명공학회 2007 JOURNAL OF PLANT BIOTECHNOLOGY Vol.34 No.3
Helicteres isora is medicinally important plant effective against asthma, diabetes, hypolipidemia, HIV, besides a good source of diosgenin. Seed dormancy and low rate of natural fruit production make this plant a perfect candidate for developing an in vitro method useful for its clonal propagation and further biotechnological developments. This is the first report on in vitro production of this plant. Nodal explants obtained from aseptically germinated seedlings were cultured on MS medium (Murashige and Skoog 1962) fortified with indole-3-acetic acid (IAA) (0.57–22.83 μM), indole-3-butyric acid (IBA) (0.41–16.58 μM), 6- benzylaminopurine (BA) (0.44–17.75 μM) and kinetin (Kin) (0.46–13.94 μM) either singly or in combinations of IAA+BA, IAA+Kin and BA+Kin. Combinations of cytokinins (BA and Kin) were most suitable for multiple shoot induction and 13.94 μM Kin+13.31 μM BA was optimum (79% frequency) associated with high number of microshoots (7.1 shoots per explant) after 20 days of culture. Maximum shoot elongation and proliferation (10 shoots per explant with 4.8 cm average height) was achieved on MS media containing 2.32 μM Kin+2.22 μM BA+2.85 μM IAA. High rooting frequency (70%) was achieved on MS medium (½ basal strength) fortified with 4.14 μM IBA, while activated charcoal showed inhibitory effects on rooting. Hardening was done with 76% survival rate and these plants were growing without any visual defects and morphologically mimicking the naturally growing plants.
In Vitro Propagation Through Nodal Explants in Helicteres isora L., a Medicinally Important Plant
Shriram, Varsha,Kumar, Vinay,Shitole, M.G. The Korean Society of Plant Biotechnology 2007 식물생명공학회지 Vol.34 No.3
Helicteres isora is medicinally important plant effective against asthma, diabetes, hypolipidemia, HIV, besides a good source of diosgenin. Seed dormancy and low rate of natural fruit production make this plant a perfect candidate for developing an in vitro method useful for its clonal propagation and further biotechnological developments. This is the first report on in vitro production of this plant. Nodal explants obtained from aseptically germinated seedlings were cultured on MS medium (Murashige and Skoog 1962) fortified with indole-3-acetic acid (IAA) ($0.57-22.83\;{\mu}M$), indole-3-butyric acid (IBA) ($0.41-16.58\;{\mu}M$), 6-benzylaminopurine (BA) ($0.44-17.75\;{\mu}M$) and kinetin (Kin) ($0.46-13.94\;{\mu}M$) either singly or in combinations of IAA + BA, IAA + Kin and BA + Kin. Combinations of cytokinins (BA and Kin) were most suitable for multiple shoot induction and $13.94\;{\mu}M\;Kin\;+\;13.31\;{\mu}M\;BA$ was optimum (79% frequency) associated with high number of microshoots (7.1 shoots per explant) after 20 days of culture. Maximum shoot elongation and proliferation (10 shoots per explant with 4.8 cm average height) was achieved on MS media containing $2.32\;{\mu}M\;Kin\;+\;2.22\;{\mu}M\;BA\;+\;2.85\;{\mu}M\;IAA$. High rooting frequency (70%) was achieved on MS medium (1/2 basal strength) fortified with $4.14\;{\mu}M$ IBA, while activated charcoal showed inhibitory effects on rooting. Hardening was done with 76% survival rate and these plants were growing without any visual defects and morphologically mimicking the naturally growing plants.
Microwave-Assisted Synthesis of 3-Styrylchromones in Alkaline Ionic Liquid
Shelke, Kiran F.,Sapkal, Suryakant B.,Shitole, Nana V.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
A simple, highly efficient and environmentally benign method for the synthesis of 3-styrylchromones from 3-formylchromones and 4-nitrophenylacetic acid/4-nitrotolune in the presence of catalytic amount of basic ionic liquid 1-butyl-3-methylimidazolium hydroxide [(bmim)OH] carried out under the influence of microwave irradiation. This method gives remarkable advantages such as, short reaction times, simple work-up procedure and moderate to good yields. The ionic liquid was successfully reused for four cycles without significant loss of activity.
Alum Catalyzed Convenient Synthesis of Quino[2,3-b][1,5 benzoxazepine α-Aminophosphonate Derivatives
Sonar, Swapnil S.,Sadaphal, Sandip A.,Shitole, Nana V.,Jogdand, Nivrutti R.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
We have described an efficient synthesis of quino[2,3-b][1,5]benzoxazepine α-aminophosphonate derivatives by the nucleophilic addition of triethyl phosphite to substituted quino[2,3-b][1,5]benzoxazepines promoted by easily available, inexpensive and mild catalyst KAl(S$O_4)_2{\cdot}12H_2$O(alum). The reactions proceed smoothly at room temperature under solvent-free reaction conditions and providing high yield of product in very short reaction time.
Microwave-Assisted Synthesis of 3-Styrylchromones in Alkaline Ionic Liquid
Kiran F. Shelke,Suryakant B. Sapkal,Nana V. Shitole,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
A simple, highly efficient and environmentally benign method for the synthesis of 3-styrylchromones from 3-formylchromones and 4-nitrophenylacetic acid/4-nitrotolune in the presence of catalytic amount of basic ionic liquid 1-butyl-3-methylimidazolium hydroxide [(bmim)OH] carried out under the influence of microwave irradiation. This method gives remarkable advantages such as, short reaction times, simple work-up procedure and moderate to good yields. The ionic liquid was successfully reused for four cycles without significant loss of activity.
Alum Catalyzed Convenient Synthesis of Quino[2,3-b][1,5]benzoxazepine α-Aminophosphonate Derivatives
Swapnil S. Sonar,Sandip A. Sadaphal,Nana V. Shitole,Nivrutti R. Jogdand,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
We have described an efficient synthesis of quino[2,3-b][1,5]benzoxazepine α-aminophosphonate derivatives by the nucleophilic addition of triethyl phosphite to substituted quino[2,3-b][1,5]benzoxazepines promoted by easily available, inexpensive and mild catalyst KAl(SO4)2・12H2O (alum). The reactions proceed smoothly at room temperature under solvent-free reaction conditions and providing high yield of product in very short reaction time.