Synthesis and vasorelaxant activity of new 1,4-benzoxazine derivatives potassium channel openers
作者:Giuseppe Caliendo、Elisa Perissutti、Vincenzo Santagada、Ferdinando Fiorino、Beatrice Severino、Roberta d'Emmanuele di Villa Bianca、Laura Lippolis、Aldo Pinto、Raffaella Sorrentino
DOI:10.1016/s0968-0896(02)00091-3
日期:2002.8
As part of a search for new potassiumchannelopeners, the synthesis and vasorelaxant activity of new 1,4-benzoxazine derivatives derived from transformation of the benzopyran skeleton of cromakalim were described. Several new 1,4-benzoxazine derivatives were provided with significant vasorelaxant activity with an overall pharmacological behavior similar to CRK (1f, 1i, 2d, 2e, 2f and 2i).
Zinc‐Mediated Radiosynthesis of Unprotected Fluorine‐18 Labelled α‐Tertiary Amides
作者:Jay S. Wright、Richard Ma、E. William Webb、Wade P. Winton、Jenelle Stauff、Kevin Cheng、Allen F. Brooks、Melanie S. Sanford、Peter J. H. Scott
DOI:10.1002/anie.202316365
日期:2024.1.8
A high-yielding radiofluorination of unprotected α-tertiary haloamides is described. This method provides a new strategy for radiochemists to install fluorine-18 into sterically protected environments for positronemissiontomographyimaging. Preliminary mechanistic studies were leveraged to develop a novel C−H radiofluorination reaction of N-sulphonyloxyamides.
With the aim of discovering new molecules with K+-channel activating properties, we have synthesized derivatives of cromakalim (CRK), an important molecule which shows specific affinity towards K+ channels, by replacing the benzopyrane ring of this reference compound with a 1,4-benzoxazine moiety. A different number of substituents showing a good discrimination between hydrophobic and electronic properties have been inserted at the 6-position of the 1,4-benzoxazine ring. We describe here the synthesis and discuss the solid state conformation of these new molecules. When tested on rat aorta ring precontracted with phenylephrine, two compounds (2c and 2d) showed a concentration-dependent relaxation similar to that measured for cromakalim but less potent than this reference drug. (C) Elsevier, Paris.