1256286-01-7Relevant articles and documents
Azidation vs [3?+?2]-cycloaddition: Chemoselective reaction of sodium azide towards o-alkynylaldehydes for the synthesis of N-heterocycles
Kumar, Pradeep,Garg, Vineeta,Verma, Akhilesh K.
, p. 1854 - 1859 (2019)
The chemoselective synthesis of functionalized azido- and triazolo-containing nitrogen heterocycles using sodium azide and o-alkynylaldehydes has been described. The azidation reaction was preferred in acetonitrile while the [3 + 2]-cycloaddition was favored in DMSO. Furthermore, the azido-pyranoquinolines were employed for the synthesis of benzonaphthyridines via the Staudinger reaction at room temperature.
Site-selective electrophilic cyclization and subsequent ring-opening: A synthetic route to pyrrolo[1,2-a]quinolines and indolizines
Aggarwal, Trapti,Kumar, Sonu,Dhaked, Devendra K.,Tiwari, Rakesh K.,Bharatam, Prasad V.,Verma, Akhilesh K.
, p. 8562 - 8573 (2012/11/07)
An efficient strategy for the synthesis of pyrrolo[1,2-a]quinolines and indolizines from pyranoquinolines via site-selective electrophilic cyclization and subsequent opening of pyran ring using silver/iodine under mild reaction conditions is described. Th
Pyrano[4,3-b]quinolines library generation via iodocyclization and palladium-catalyzed coupling reactions
Aggarwal, Trapti,Imam, Maryam,Kaushik, Naveen K.,Chauhan, Virander S.,Verma, Akhilesh K.
experimental part, p. 530 - 536 (2011/11/06)
Synthesis of a 80-member library of novel pyrano[4,3-b]quinolines in solution-phase is reported. The key intermediate, 4-iodopyrano[4,3-b]quinolines were synthesized by the electrophilic iodocyclization of corresponding ortho-alkynyl aldehydes in good to
Iodine-mediated solvent-controlled selective electrophilic cyclization and oxidative esterification of o-alkynyl aldehydes: An easy access to pyranoquinolines, pyranoquinolinones, and isocumarins
Verma, Akhilesh K.,Rustagi, Vineeta,Aggarwal, Trapti,Singh, Amit P.
experimental part, p. 7691 - 7703 (2010/12/29)
Chemoselective behavior of iodine in different solvents in the electrophilic iodocyclization of o-alkynyl aldehydes is described. o-Alkynyl aldehydes 3a-t on reaction with I2 in CH2Cl2 with appropriate nucleophiles provides pyrano[4,3-b]quinolines 4a-f, via formation of cyclic iodonium intermediate Q; however, using alcohols as a solvent as well as nucleophile, o-alkynyl esters 5a-y were obtained selectively in good to excellent yields via formation of hypoiodide intermediate R. Subsequently, o-alkynyl esters were converted in to pyranoquinolinones 6a-i and isocoumarin 6j by electrophilic iodocyclization. This developed oxidative esterification provides a novel access for the chemoselective synthesis of esters 5q-u from aldehydes 3n-p without oxidizing primary alcohol present in the substrate.