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Heteroannulation of nitroketene N,S-arylaminoacetals with POCl3: a novel highly regioselective synthesis of unsymmetrical 2,3-substituted quinoxalines.
- C. Venkatesh, B. Singh, P. Mahata, H. Ila, H. Junjappa
- Medicine, Chemistry
- Organic letters
- 30 April 2005
[reaction: see text]. A novel regioselective route for the synthesis of substituted and fused 3-chloro-2-(methylthio)quinoxalines through POCl3-mediated heteroannulation of a range of… Expand
Cyclocondensation of Hydroxylamine with 1,3‐Bis(het)arylmonothio 1,3‐Diketones and 1,3‐Bis(het)aryl‐3‐(methylthio)‐2‐propenones: Synthesis of 3,5‐Bis(het)arylisoxazoles with Complementary…
- B. Raghava, G. Parameshwarappa, Anand Acharya, T. R. Swaroop, K. S. Rangappa, H. Ila
- 1 March 2014
Efficient routes for the regioselective synthesis of 3,5-bis(het)arylisoxazoles with complementary regioselectivity have been developed. The methods involve the cyclocondensation of hydroxylamine… Expand
An expeditious synthesis of substituted and annelated pyrido[2,3-b]indoles
An efficient and versatile synthesis of substituted and annelated pyrido[2,3-b]indoles (α-carboline) involving conjugate displacement on α-oxoketene dithioacetals by 1-methyl-2-oxoindole enolate… Expand
Studies on regioselective addition of benzylic organometallics to α-oxoketene dithioacetals in our aromatic annelation protocol
Abstract The α-oxoketene dithioacetals derived from various acyclic and cyclic active methylene ketones are shown to undergo either 1,2- or sequential 1,4- and 1,2-addition with various substituted… Expand
Enantioselective palladium-catalyzed transformations.
Regio‐ und chemoselektive Metallierung von Arenen und Heteroarenen mit gehinderten Metallamidbasen
Efficient routes to pyrazolo[3,4-b]indoles and pyrazolo[1,5-a]benzimidazoles via palladium- and copper-catalyzed intramolecular C-C and C-N bond formation.
Efficient synthetic routes to pyrazolo[3,4-b]indoles and pyrazolo[1,5-a]benzimidazoles via intramolecular palladium- and copper-catalyzed cyclization of 1-aryl/1-unsubstituted… Expand
α-Oxoketene-S,S-, N,S- and N,N-acetals: Versatile intermediates in organic synthesis
Highly Diastereoselective [3+2] Cyclopenta[b]annulation of Indoles with2-Arylcyclopropyl Ketones and Diesters†
A highly diastereoselective Lewis acid (BF3·Et2O or TiCl4) induced [3+2] cycloaddition of substituted and unsubstituted indoles with 2-arylcyclopropyl ketones/diesters yielding cyclopenta[b]indoles… Expand
Regioselective synthesis of 1-aryl-3,4-substituted/annulated-5-(methylthio)pyrazoles and 1-aryl-3-(methylthio)-4,5-substituted/annulated pyrazoles.
- S. Peruncheralathan, T. Khan, H. Ila, H. Junjappa
- Chemistry, Medicine
- The Journal of organic chemistry
- 19 October 2005
[reaction: see text] Highly efficient and regioselective synthesis of 1-aryl-3,4-substituted/annulated-5-(methylthio)pyrazoles and 1-aryl-3-(methylthio)-4,5-substituted/annulated pyrazoles has been… Expand