One-pot preparation of 2,5-disubstituted and 2,4,5-trisubstituted oxazoles from aromatic ketones with molecular iodine, oxone, and trifluoromethanesulfonic acid in nitriles
Alkyl aryl ketones were successfully converted into the corresponding 2,5-disubstituted and 2,4,5-trisubstituted oxazoles in good to moderate yields in a one-pot manner, utilizing iodine, Oxone®, and trifluoromethanesulfonic acid in nitriles under transition-metal-free conditions. The present method could be used for the preparation of Oxaprozin from benzyl phenyl ketone and succinonitrile. A possible
Iodoarene-catalyzed one-pot preparation of 2,4,5-trisubstituted oxazoles from alkyl aryl ketones with mCPBA in nitriles
作者:Yuhta Kawano、Hideo Togo
DOI:10.1016/j.tet.2009.05.003
日期:2009.8
aryliodonium I(III) species reacts with alkylaryl ketone to form β-keto aryliodonium species. This in turn, reacts with nitrile to form the corresponding oxazole. Iodoarene works as a catalyst. However, one equivalent of iodoarene is required because one equivalent of reactive aryliodonium I(III) species must be formed prior to the reaction with alkylaryl ketone. Then, by introducing an ionic liquid
The present invention provides a compound of Formula (I)
as described herein, or a pharmaceutically acceptable salt or a solvate thereof. The present invention also provides pharmaceutical compositions comprising one or more said compounds, and methods for using said compounds for treating or preventing a thromboses, embolisms, hypercoagulability or fibrotic changes.
A novel and direct synthesis of 2-alkyl-5-aryl disubstituted oxazoles
作者:Jong Chan Lee、Taiyoung Hong
DOI:10.1016/s0040-4039(97)10362-8
日期:1997.12
A direct and efficient method for the preparation of 2-alkyl-5-aryl disubstituted oxazoles was realized by reaction of aromatic alpha-methyl ketones with various aliphatic nitriles in the presence of Tl(OTf)(3). (C) 1997 Elsevier Science Ltd.