A Direct Cycloaminative Approach to Imidazole Derivatives via Dual C–H Functionalization
作者:Sagar Arepally、Venkata Nagarjuna Babu、Manickam Bakthadoss、Duddu S. Sharada
DOI:10.1021/acs.orglett.7b01840
日期:2017.10.6
ed C(sp3)–H azidation was a keystep for the cycloaminative process. An unprecedented method for metal-free dehydrogenative N-incorporation into C(sp3)–H and C(sp2)–H bonds for the synthesis of diverse imidazoles has been disclosed. The overall transformation involves the construction of four C–N bonds through hydroamination-azidation-cyclization sequence. The reaction can be easily handled and proceeds
The photochemistry of α-Azidocinnamates - a reinvestigation
作者:Otto Meth-Cohn、Nicola J.R Williams、Angus MacKinnon、Judith A.K Howard
DOI:10.1016/s0040-4020(98)00537-7
日期:1998.8
efficient manner by photolysis using quartz equipment.1 We find that use of pyrex filters or ketone sensitisation instead of quartz leads to high yields of the presumed intermediate diastereomeric pair of aziridinoimidazoline dimers, as does brief irradiation in quartz. These dimers have been characterised by spectral and crystallographic methods, and shown to oxidise with DDQ to give imidazoledicarboxylic
Synthesis and N-Alkylation of 2-Alkyl-and 2-Arylimidazole-4,5-dicarboxylic acid esters
作者:A. V. Lebedev、A. B. Lebedeva、V. D. Sheludyakov、E. A. Kovaleva、O. L. Ustinova、V. V. Shatunov
DOI:10.1134/s1070363207050234
日期:2007.5
Nitration of D-tartaric acid, followed by treatment of the resulting dinitrotartaric acid with ammonia and aldehydes gave 2-phenyl-, 2-(2-pyridyl)-, 2-isopropyl-, and 2-isobutylimidazole-4,5-dicarboxylic acids. Some factors affecting the yield of the final products were revealed, and optimal conditions for their esterification were found. N-Alkylation of 2-substituted imidazole-4,5-dicarboxylates thus obtained involves considerable steric hindrances; therefore, the corresponding N-alkyl derivatives can be obtained in a poor yield only in the presence of such a strong base as 1,8-diazabicyclo[5.4.0]undec-7-ene.
The True Story of Pertussis Vaccination: A Sordid Legacy?
作者:D. Geier
DOI:10.1093/jhmas/57.3.249
日期:2002.7.1
Photocatalytic Visible-Light-Induced Nitrogen Insertion via Dual C(sp<sup>3</sup>)–H and C(sp<sup>2</sup>)–H Bond Functionalization: Access to Privileged Imidazole-based Scaffolds
作者:Srilaxmi M. Patel、Ermiya Prasad P.、Manickam Bakthadoss、Duddu S. Sharada
DOI:10.1021/acs.orglett.0c03269
日期:2021.1.15
imidazoles and privileged dihydroisoquinoline-based imidazole derivatives via C(sp3)–H and C(sp2)–H bond functionalization. A sustainable, convenient, metal-free azidation/C–H aminative cyclization approach in the absence of stoichiometric oxidants is presented. This protocol involves a rare photoinduced iminyl radical as a keyintermediate for the “N” insertion.