A novel eco‐friendly on‐water protocol for the synthesis of 2,2‐disubstituted 2,
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3‐dihydro‐1
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‐perimidines
作者:Nissy Ann Harry、Thomas Shilpa、Sankuviruthiyil M. Ujwaldev、Gopinathan Anilkumar
DOI:10.1002/jhet.4146
日期:2021.1
An efficient green on‐water protocol for the synthesis of 2,2‐disubstituted 2,3‐dihydro‐1H‐perimidines is demonstrated. The reaction used safer p‐toluenesulfonic acid (PTSA) as a catalyst on water at 80°C, for 2 hours affording a novel method for the synthesis of various disubstituted perimidines in moderate to excellent yields.
Green and Efficient Synthesis of Quinoxaline Derivatives via Ceric Ammonium Nitrate Promoted and in Situ Aerobic Oxidation of .ALPHA.-Hydroxy Ketones and .ALPHA.-Keto Oximes in Aqueous Media
作者:Ahmad Shaabani、Ali Maleki
DOI:10.1248/cpb.56.79
日期:——
The direct conversion of alpha-hydroxy ketones and alpha-keto oximes into quinoxaline derivatives in the presence of a catalytic amount of ceric ammonium nitrate via metal-catalyzed aerobic oxidation followed by in situ trapping with aromatic 1,2-diamines in water as a green and efficient reaction media, is reported.
Near-infrared-absorbing squaraine dyes containing 2,3-dihydroperimidine terminal groups
作者:Kasali A. Bello、S. Nigel Corns、John Griffiths
DOI:10.1039/c39930000452
日期:——
Condensation of 2,3-dihydroperimidines with squaric acid under conditions of azeotropic removal of water affords a new class of diarylsquaraine dyes with intense absorption bands at ca. 800nm.