The regioselectivity of the formation of 2-pyrazolylthiazoles and their precursors from the reaction of 2-hydrazinothiazoles with 4,4,4-trifluoro-1-hetaryl-1,3-butanediones
作者:Anna B. Denisova、Vyacheslav Ya. Sosnovskikh、Wim Dehaen、Suzanne Toppet、Luc Van Meervelt、Vasiliy A. Bakulev
DOI:10.1016/s0022-1139(02)00060-x
日期:2002.6
Reaction of 2-hydrazinothiazoles 1 with 1-thienyl- and 1-furyl-1,3-butanediones 2a,b in methanol in the presence of hydrochloric acid mainly leads to a mixture of pyrazoles 3 and pyrazolines 4 or pyrazoles 3 and 5 in strong acidic conditions. Isomeric hydrazones 6 and pyrazolines 4 were formed and isolated in these reactions in the absence of hydrochloric acid. It has been shown that the regioselectivity in the reaction of diketones 2 with hydrazine 1 is governed by both the concentration of acid and the nature of substituents in the 1,3-diketones 2. Cyclization of hydrazones 6 is shown to occur under milder conditions than dehydration for pyrazolines 4. The new heterocyclic compounds were prepared and fully characterized by NMR spectra and by X-ray analysis for 3c. (C) 2002 Elsevier Science B.V. All rights reserved.
SINGH, S. P.;SEHGAL, SUBHASH;TARAR, LUKHVINDER SINGH;DHAWAN, S. N., INDIAN J. CHEM. B, 29,(1990) N, C. 310-314
作者:SINGH, S. P.、SEHGAL, SUBHASH、TARAR, LUKHVINDER SINGH、DHAWAN, S. N.
DOI:——
日期:——
Singh; Sehgal; Sing Tarar, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1990, vol. 29, # 4, p. 310 - 314