Synthesis of new chiral N-substituted fused pyrazoles and pyrazolinols
摘要:
Treatment of beta-diketones and the corresponding beta-enaminoketones, having modified carane (2-ethyl-6,6-dimethylbicyclo[3.1.0]hexane) and p-menthane (3-ethyl-1-isopropylcyclopentane) skeletons, with aryl-and alkylhydrazines results in regioselective formation of N-substituted pyrazoles or stable pyrazolinols depending on the nature of the substituent at the hydrazine nitrogen. (C) 1997 Elsevier Science Ltd.
SYNTHESIS OF 2-ALKYL AND 2-ARYL PYRIMIDINES FROM β-CHLOROVINYL KETONES OF CYCLOPENTANONE TYPE
作者:Sergey A. Popov、Alexey V. Tkachev
DOI:10.1081/scc-100000204
日期:2001.1
Amidines react in the presence of NaHCO3 with β-chlorovinyl ketones, prepared regioselectively by the reaction of 2-acetylcyclo- pentanone-type diketones with PPh3-CCl4 in 73–78% yield, to afford 2-alkyl (aryl)-pyrimidines annelated with cyclopentane derivatives in 79–87% yields.