One-pot synthesis of 4-(phenylselanyl)-substituted pyrazoles


ZORA M. , DEMİRCİ D., KIVRAK A., Kelgokmen Y.

TETRAHEDRON LETTERS, cilt.57, ss.993-997, 2016 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 57 Konu: 9
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.tetlet.2016.01.071
  • Dergi Adı: TETRAHEDRON LETTERS
  • Sayfa Sayıları: ss.993-997

Özet

A facile, one-pot, general synthetic method for the preparation of 4-(phenylselanyl)pyrazoles is described. When reacted with hydrazines, alpha,beta-alkynic aldehydes produced in situ alpha,beta-alkynic hydrazones, which, upon treatment with phenylselenyl chloride, undergo cyclization to afford 4-(phenylselanyl)pyrazoles in good to high yields. This cyclization has been found to be general for a variety of in situ generated alpha,beta-alkynic hydrazones and exhibits good tolerance to a broad range of substituents, including electron-donating and electron-withdrawing groups. The enrichment of the pyrazole core with a selenyl moiety as well as with aryl and/or ferrocenyl groups may offer potential for the synthesis of molecules with pronounced or distinct biological activities. (C) 2016 Elsevier Ltd. All rights reserved.