Switchable ring-contractive extrusion reactions of 2,5-dihydro-1,4,5-thiadiazepine S-oxides are described, which allow expedient access to pyridazines under thermal conditions or pyrazoles under Lewis acid-mediated conditions.
Regitz, Manfred; Martin, Roland, Liebigs Annalen der Chemie, 1984, # 10, p. 1641 - 1652
作者:Regitz, Manfred、Martin, Roland
DOI:——
日期:——
Generation and cycloaddition of polymer-supported azomethine imines: traceless synthesis of pyrazole derivatives from α-silylnitrosoamide derivatives bound to resin
1,3-Dipolar cycloaddition of polymer-supported azomethine imines with dimethyl acetylenedicarboxylate (DMAD) gave pyrazole derivatives in good yields. The azomethine imines were generated from polymer-supported alpha-silylnitrosoamides by a 1,4-silatropic shift. The feature of this reaction is that no cleavage operations are required after the cycloaddition. (C) 2000 Elsevier Science Ltd. All rights reserved.
Drozd, V. N.; Sergeichuk, V. V., Journal of Organic Chemistry USSR (English Translation), 1982, vol. 18, p. 2318 - 2319