Untersuchungen von N- oder N′-blockierten Acylharnstoffen im Verhalten gegen Amine
作者:Harald G. Schweim
DOI:10.1002/ardp.19873200509
日期:——
Um die Reaktionsmöglichkeiten vonN‐Acylharnstoffen mit Aminen eindeutiger zu gestalten, wurden N bzw. N′ blockierte Derivate hergestellt; ihr Spaltungsverhalten wurde in Modellreaktionen untersucht.
为了阐明N-酰基脲与胺类反应的可能性,制备了N和N'封闭衍生物;在模型反应中研究了它们的裂解行为。
Studies on pyrrolidinones. On the carbamoylation of some pyroglutamic derivatives
The carbamoylation of some lactams derivatived from pyroglutamic acid as been studied; better yields were obtained starting from the unsubstitued lactam (toluene, 80°) rather than starting with the N-silyllactam (room temperature), although these latter reaction conditions could be interesting for heat sensitive compounds. Methyl and phenyl isothiocyanate react only with the sodium salt of methyl pyroglutamate
Synthesis, Decarboxylation, and Nitrosation of 1-Acyl-2-pyrrolidone-3-carboxylic Acids: A Convenient Novel Entry to 2,3-Dioxopyrrolidine Derivatives
作者:Viktoras Gailius、Helmut Stamm
DOI:10.1002/ardp.19923250207
日期:——
Esters 1 of 1‐acyl‐2‐pyrrolidone‐3‐carboxylic acids 2 were hydrolized to 2 with acetic acid/HCl at 60–70°C. Reaction of 1a with formic acid/HCl at 60–75°C led to (not isolated) 2a which began to decarboxylate to 3a during the conversion of 1a to 2a even at this low temp. Decarboxylation of 2c‐f was accomplished at 160°C without solvent. Decarboxylative nitrosation of 2c‐f yielded the oximes 4c‐f of 1‐acyl‐2
SCHWEIM H. G., ARCH. PHARM., 320,(1987) N 5, 430-437
作者:SCHWEIM H. G.
DOI:——
日期:——
Iron(II)-Catalyzed Oxidation of sp<sup>3</sup> C−H Bonds Adjacent to a Nitrogen Atom of Unprotected Arylureas with <i>tert</i>-Butyl Hydroperoxide in Water
With a FeSO4/TBHP system in water, direct oxidation of sp3 C−Hbondsadjacent to nitrogen of arylureas to give both unprecedented tert-butoxylated and hydroxylated products 2 was revealed. Under elevated temperatures, either 2-oxo-N-arylpyrrolidine-1-carboxamides 3 or 1,3-diarylureas 4 were attained, depending on the aliphatic ring size of the arylurea substrates.