One-pot sequential multicomponent reaction between <i>in situ</i> generated aldimines and succinaldehyde: facile synthesis of substituted pyrrole-3-carbaldehydes and applications towards medicinally important fused heterocycles
作者:Anoop Singh、Nisar A. Mir、Sachin Choudhary、Deepika Singh、Preetika Sharma、Rajni Kant、Indresh Kumar
DOI:10.1039/c8ra01637b
日期:——
An efficient sequential multi-component method for the synthesis of N-arylpyrrole-3-carbaldehydes has been developed. This reaction involved a proline-catalyzed direct Mannich reaction-cyclization sequence between succinaldehyde and in situ generated Ar/HetAr/indolyl-imines, followed by IBX-mediated oxidative aromatization in one-pot operation. The practical utility of this procedure is shown at gram-scale
Enantioselective synthesis of 1,2,5,6-tetrahydropyridines (THPs) via proline-catalyzed direct Mannich-cyclization/domino oxidation–reduction sequence: application for medicinally important N-heterocycles
作者:Panduga Ramaraju、Nisar A. Mir、Deepika Singh、Indresh Kumar
DOI:10.1039/c6ra12965j
日期:——
An enantioselective multi-component synthesis of 1,2,5,6-tetrahydropyridines (THPs) has been developed through a one-pot domino-process. This transformation proceeds through proline-catalyzed direct Mannich reaction-cyclization of glutaraldehyde with in situ generated imines, followed by site-selective oxidation–reduction sequence under mild conditions. Chiral 1,2,5,6-THPs are obtained in good to high
An Unprecedented Pseudo-[3+2] Annulation between <i>N</i>
-(4-Methoxyphenyl)aldimines and Aqueous Glutaraldehyde: Direct Synthesis of Pyrrole-2,4-dialdehydes
作者:Panduga Ramaraju、Nisar A. Mir、Deepika Singh、Preetika Sharma、Rajni Kant、Indresh Kumar
DOI:10.1002/ejoc.201700500
日期:2017.6.30
A new method for the direct one-pot synthesis of substituted pyrrole-2,4-dialdehdyes was developed. This overall pseudo-[3+2]-annulation reaction between glutaraldehyde and N-(4-methoxyphenyl)aldimines proceeds through proline-catalyzed direct Mannich reaction/cyclization, followed by 2-iodoxybenzoic acid mediated oxidative rearrangement of the in situ generated intermediate to give pyrrole-2,4-dialdehydes
Enantioselective Synthesis of <i>N</i>-PMP-1,2-dihydropyridines via Formal [4 + 2] Cycloaddition between Aqueous Glutaraldehyde and Imines
作者:Panduga Ramaraju、Nisar A. Mir、Deepika Singh、Vivek K. Gupta、Rajni Kant、Indresh Kumar
DOI:10.1021/acs.orglett.5b02744
日期:2015.11.20
A simple and highly practical one-pot formal [4 + 2] cycloaddition approach for the enantioselective synthesis of N-PMP-1,2-dihydropyridines (DHPs) is described. This chemistry involves an amino-catalytic direct Mannich reaction/cyclization followed by IBX-mediated chemo- and regioselective oxidation sequence between readily available aqueous glutaraldehyde and imines under very mild conditions. A
The one-pot synthesis of 2-arylquinoline with arylamines, arylaldehyde, and 1,1-diethoxyethane were studied using a catalytic amount ytterbium triflate. Various 2-arylquinolines showed fluorescence...