Organocatalytic Aerobic Oxidative Cleavage of Cyclic 1,2-Diketones
摘要:
The first organocatalytic aerobic oxidative cleavage of cyclic 1,2-diketones is reported. The reaction occurs in either aqueous or alcoholic media and is promoted by a simple N-heterocyclic carbene catalyst derived from a 1,2,4-triazolium ion. No strong oxidants are required. The application of the process in a one-pot synthesis of a cyclic anhydride is also possible.
Novel bis-1,2-dihydro-3H-dibenzisoquinoline-1,3-diones and their salts, processes for their preparation, pharmaceutical compositions containing them and methods of using them to treat malignancies, mainly human solid tumor carcinomas.
Purpose: To examine the inotropic and chronotropic effects of xenon (Xe) and nitrous oxide (N2O) compared with nitrogen (N-2) on isolated rat hearts. The differences between Xe and N2O were also compared.Methods: The effects of Xe, N2O and N-2 on coronary perfusion pressure (CPP), heart rate, left ventricular developed pressure (LVDP) and double product (DP) were examined in isolated rat hearts perfused at constant flow (10 mL.min(-1)). Following stabilization and baseline measurement with 95% O-2 (plus 5% CO2), the heart was exposed to buffer equilibrated with one of three test gases; 50% N-2 with 4596 O-2 (Group N-2: n=9),50% Xe with 45% O-2 (Group Xe: n=9), or 50% N2O with 45% O-2 (Group N2O: n=9) for 30 min. Measurements were performed in the last minute of exposure to the test gases.Results: Gas exposure in all three groups decreased O-2 delivery (-50%), CPP (-11%), LVDP (-30%) and DP (-44%) compared with baseline values (P < 0.001). However, there were no differences among the groups.Conclusion: Our data suggest that cardiac contractility was decreased by the effects of reduced O-2 delivery but both Xe and N2O did not cause further cardiac depressant effects compared to N-2 in this experimental model.
Neugebauer, Wolfgang; Clark, Timothy; Schleyer, Paul von Rague, Chemische Berichte, 1983, vol. 116, # 10, p. 3283 - 3292
作者:Neugebauer, Wolfgang、Clark, Timothy、Schleyer, Paul von Rague
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Kardos, Chemische Berichte, 1913, vol. 46, p. 2090
作者:Kardos
DOI:——
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NEUGEBAUER, W.;CLARK, T.;SCHLEYER, P. R., CHEM. BER., 1983, 116, N 10, 3283-3292