Ring Opening of Epoxides and Aziridines with Sodium Azide using Oxone<sup>®</sup>in Aqueous Acetonitrile: A Highly Regioselective Azidolysis Reaction
作者:Gowravaram Sabitha、R. Satheesh Babu、M. Shashi Reddy、J. S. Yadav
DOI:10.1055/s-2002-34848
日期:——
A wide variety of epoxides and aziridines were converted to the corresponding β-azido alcohols and β-azido amines with sodiumazide using Oxone® in aqueous acetonitrile. The reactions were highly regioselective and efficient with excellent yields at room temperature under mild reaction conditions.
Catalyst-Free Highly Regio- and Stereoselective Ring Opening of Epoxides and Aziridines with Sodium Azide Using Poly(ethylene glycol) as an Efficient Reaction Medium
Ring opening of epoxides and aziridines has readily been carried out at room temperature using poly(ethylene glycol) (PEG-400) as the efficient reaction medium to form the corresponding 2-azido alcohols and 2-azido amines, respectively, in excellent yields (95-99%) within 30-45 minutes and with high regio- and streoselectivity.
Cerium(III) Chloride Promoted Highly Regioselective Ring Opening of Epoxides and Aziridines Using NaN<sub>3</sub> in Acetonitrile: A Facile Synthesis of 1,2-Azidoalcohols and 1,2-Azidoamines
作者:Gowravaram Sabitha、R. Satheesh Babu、M. Rajkumar、J. S. Yadav
DOI:10.1021/ol016979q
日期:2002.2.1
[GRAPHICS]convenient and efficient synthesis of 1,2-azidoalcohols and 1,2-azidoamines has been achieved by ring opening of epoxides and aziridines using cerium(Ill) chloride and sodium azide in acetonitrile. The reaction is highly regloselective and afforded the corresponding products in good to excellent yields under mild and neutral reaction conditions. The method is very rapid and equally compatible for both epoxides and aziridines.
Carbon isotope labeling of carbamates by late-stage [<sup>11</sup>C], [<sup>13</sup>C] and [<sup>14</sup>C]carbon dioxide incorporation
late-stage [11C], [13C] and [14C]carbon isotope labeling of cyclic carbamates is reported. This protocol allows the incorporation of carbon dioxide, the primary source of carbon-14 and carbon-11 radioisotopes, in a direct, cost-effective and sustainable manner. A disconnection/reconnection strategy, involving ringopening/isotopic closure, was also implemented.