Amination of Benzoxazoles and 1,3,4-Oxadiazoles Using 2,2,6,6-Tetramethylpiperidine-N-oxoammonium Tetrafluoroborate as an Organic Oxidant
作者:Sebastian Wertz、Shintaro Kodama、Armido Studer
DOI:10.1002/anie.201104735
日期:2011.11.25
No transition metals are necessary to convert benzoxazoles and 1,3,4‐oxadiazoles into the corresponding pharmacologically interesting 2‐aminated heterocycles by formal direct C(2)‐aminationusing tetramethylpiperidine‐N‐oxoammonium tetrafluoroborate (TEMPO+BF4−) as an oxidant (see scheme; TEMP=2,2,6,6‐tetramethylpiperidine; TfOH=trifluoromethanesulfonic acid).
Efficient Phosphonium-Mediated Synthesis of 2-Amino-1,3,4-oxadiazoles
作者:Christopher G. Levins、Zhao-Kui Wan
DOI:10.1021/ol8004084
日期:2008.5.1
We present an efficient, room temperature procedure for the preparation of 2-amino-1,3,4-oxadiazoles, Oxadiazol-2-ones can be activated for S(N)Ar substitution using phosphonium reagents (e.g., BOP). This approach provides convenient access to N,N-disubstituted 2-amino-1,3,4-oxadiazoles, which are difficult to prepare using existing synthetic strategies.
Madhavan,R.; Srinivasan,V.R., Indian Journal of Chemistry, 1969, vol. 7, p. 760 - 765