[EN] USE OF 2-OXO-2H-PYRROL-1(5H)-CARBOXAMIDE DERIVATIVES AS ANTI-HIV AGENTS AND PROCESS FOR THE PRODUCTION THEREOF [FR] UTILISATION DE DÉRIVÉS DE 2-OXO-2H-PYRROL-L(5H)-CARBOXAMIDE EN TANT QU'AGENTS ANTI-VIH ET PROCÉDÉ DE PRODUCTION ASSOCIÉ
Nitrogen heterocycles by palladium-catalysed oxidative cyclization-alkoxycarbonylation of acetylenic ureas
作者:Alessia Bacchi、Gian Paolo Chiusoli、Mirco Costa、Cristian Sani、Bartolo Gabriele、Giuseppe Salerno
DOI:10.1016/s0022-328x(97)00459-2
日期:1998.7
Acetylenic ureas readily undergo oxidative cyclization-alkoxycarbonylation reactions in the presence of PdI2 (or Pd/C)-KI as catalyst in methanol under mild conditions (65°C and 24 bar of a 3:1 mixture of CO and air). Cyclization occurs by trans-attack of oxygen or cis-attack of nitrogen functions on the triple bond, followed by stereospecific carbonylation, resulting in E or Z-stereochemistry, respectively
Unexpected Stereoselective Access to 2‐Aminooxazolines from Propargyl Ureas by Silver Salts under Mild Conditions
作者:Aleksandr Voronov、Alessandra Casnati、Paolo P. Mazzeo、Paolo Pelagatti、Alessia Bacchi、Raffaella Mancuso、Bartolo Gabriele、Elena Motti、Giovanni Maestri、Péter Pál Fehér、András Stirling、Nicola Della Ca'
DOI:10.1002/adsc.202200950
日期:——
Propargyl ureas can lead to a range of possible heterocyclic compounds, mainly depending on the employed catalyst. Silver salts are known to promote the N-5-exo-dig cyclization mode to imidazolidinone derivatives. Conversely, a versatile and stereoselective O-5-exo-dig cyclization of propargyl ureas to 2-aminooxazolines by Ag(I) catalysis is here disclosed. Good to excellent yields and complete stereoselectivity
A variety of prop-2-ynylamides have been carbonylated under oxidative conditions to give oxazolines, oxazolines with chelating groups, and bisoxazolines bearing an (alkoxycarbonyl)methylene chain at the 5 position in good yields. The cyclization-alkoxycarbonylation process was carried out in alcoholic media at 50-70 degreesC and under 24 bar pressure of 3:1 carbon monoxide/air in the presence of catalytic amounts of 10% Pd/C or PdI2 in conjunction with KI. Cyclization occurred by anti attack of an oxygen function on the palladium-coordinated triple bond, followed by stereospecific alkoxycarbonylation, strictly resulting in E-stereochemistry. The structures of representative oxazolines and bisoxazolines have been determined by X-ray diffraction analysis.
AZERBAEV I. N.; TSOJ L. A.; SALIMBAEVA A. D.; CHOLPANKULOVA S. T.; RYSKIE+, TR. IN-TA XIM. HAYK AN KAZSSR, 1980, 52, 128-146
作者:AZERBAEV I. N.、 TSOJ L. A.、 SALIMBAEVA A. D.、 CHOLPANKULOVA S. T.、 RYSKIE+
DOI:——
日期:——
TSOJ L. A.; RYSKIEVA K. A., IZV. AN KAZSSR. CEP. XIM.,(1986) N 4, 78-83