Convenient Synthesis of Ethyl 4-Aryl-6-(trifluoromethyl)-2-oxo-2H-pyran-3-carboxylates and 4-Aryl-6-(trifluoromethyl)-2H-pyran-2-ones: Novel Highly Reactive CF3-Containing Building Blocks
摘要:
An expedient synthesis of a series of 2-pyrones, bearing a CF3 group at the 6-position and aryl group at position 4, from readily available aryl-4,4,4-trifluorobutane-1,3-diones, PCl5, and sodium diethyl malonate is described.
Isothiourea-Mediated One-Pot Synthesis of Trifluoromethyl Substituted 2-Pyrones
作者:Pei-Pei Yeh、David S. B. Daniels、David B. Cordes、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1021/ol403697h
日期:2014.2.7
A one-potisothiourea-mediated Michael addition/lactonization/thiol elimination cascade sequence for the formation of 4,6-disubstituted and 3,4,6-trisubstituted 2-pyrones from (phenylthio)acetic acids and α,β-unsaturated trifluoromethyl ketones is described. The synthesis of a COX-2 inhibitor and the wide-ranging derivatization of the 2-pyrone moiety to trifluoromethyl substituted aromatics and heteroaromatics