Reactions of arylazosulfones with the conjugate bases of (tert-butoxycarbonyl)methyl and tosylmethyl isocyanide. Synthesis of substituted 1-arylimidazoles
摘要:
The reactions of arylazosulfones 1 (ArN=NSO2Ar') with the potassium salts of (tert-butoxycarbonyl)methyl 2 and tosylmethyl isocyanide 3 in DMSO afford 4,5-bis(tert-butoxycarbonyl)-4 and 4-tosyl-1-arylimidazoles 5, respectively. Yields of imidazoles 4 and 5 vary from moderate to excellent depending on the nature both of Ar in 1 and of the nucleophile (2 or 3) employed. A comparison of the results obtained with those relevant to the reactions of the same nucleophiles with nitrosobenzene in analogous experimental conditions provides useful mechanistic indications on the transformation of 1 to 4 or 5. (C) 1997, Elsevier Science Ltd.
this paper, aryldiazo sulfones are prepared from tandem sulfonylation/dehydrogenation reactions of arylhydrazines and sulfonyl chlorides. The transformations proceed well in the presence of catalytic CuSO4·5H2O, leading to aryldiazo sulfones in good to excellent yields. It is believed that this protocol represents a safe and convenient model for the synthesis of these versatile aryldiazo sulfones under
Splitting constants and g values are reported for 5,5‐dimethylpyrrolidine 1‐oxide spin adducts with radicals such as substituted‐Ph˙, NaSO3˙, PhS2˙, and others observed in the photochemicaldecomposition of azocompounds in various solvents.
报告了 5,5-二甲基吡咯烷 1-氧化物自旋加合物的分裂常数和 g 值,该加合物具有取代的 Ph·、NaSO3·、PhS2· 等自由基,这些自由基在偶氮化合物在各种溶剂中的光化学分解中观察到。
Hantzsch; Singer, Chemische Berichte, 1897, vol. 30, p. 314
作者:Hantzsch、Singer
DOI:——
日期:——
Neplyuev,V.M. et al., Journal of Organic Chemistry USSR (English Translation), 1975, vol. 11, p. 843 - 848
作者:Neplyuev,V.M. et al.
DOI:——
日期:——
Bamberger, Chemische Berichte, 1920, vol. 53, p. 2320