A novel approach towards highly functionalized fluoroalkyl pyrazoles was developed by using fluoroalkyl amino reagents in combination with a variety of fluorinated ketimines. Tuneable introduction of fluoroalkyl groups in the 3- and 5-positions was possible by using vinamidinium intermediates or the corresponding enamino ketones after hydrolysis. These high-value building blocks can give rise to a large number of analogues for bioactivity screening and discovering new heterocyclic bioactive ingredients in various life science fields.
Keywords: cyclization; fluoroalkyl amino reagents; nitrogen heterocycles; regioselectivity; synthetic methods.
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.