A novel synthetic pathway to benzoquinazolines from naphthylamines is reported. Benzoquinazoline nucleus was cyclized in good yield from N-protected naphthylamines using hexamethylenetetramine in TFA and potassium ferricyanide in aqueous ethanolic KOH. This method is efficient and convenient with respect to previously reported synthetic pathways.
A Novel PdCl2/ZrO2–SO2−4 Catalyst for Synthesis of Carbamates by Oxidative Carbonylation of Amines
作者:Feng Shi、Youquan Deng、Tianlong SiMa、Hongzhou Yang
DOI:10.1006/jcat.2001.3350
日期:2001.10
At 170°C and ca. 4.0 MPa, oxidative carbonylation of aromatic amines to synthesize corresponding carbamates over a novel PdCl2/ZrO2–SO2−4 catalyst could proceed with high conversion and selectivity.
Are aroylnitrenes ground-state singlets? Photochemistry of .beta.-naphthoyl azide
作者:Tom Autrey、Gary B. Schuster
DOI:10.1021/ja00253a037
日期:1987.9
triplet-sensitized photolyses of ..beta..-naphthoyl azide (BNA) give nitrene-derived products indicative of reaction only from the singlet state of ..beta..-naphthoylnitrene (BNN). The triplet nitrene is not detected in chemical trapping or spectroscopic experiments, which readily reveal related intermediates. The results require that the energy of singlet BNN be very close to or below the energy of triplet