Stereochemistry and reactivity of F- and H-vinyldiazocarbonyl compounds and their phosphazines: synthesis of pyrazoles and pyridazines
作者:Murat B. Supurgibekov、Valerija M. Zakharova、Jochim Sieler、Valerij A. Nikolaev
DOI:10.1016/j.tetlet.2010.11.073
日期:2011.1
tituted (F) 2-vinyl-2-diazocarbonyl compounds, having cis-relationship of functional groups (AlkO2C, CN2), do not undergo 1,5-electrocyclization, but readily take part in the tandem Staudinger–diaza-Wittig reactions to produce trifluoromethyl-substituted pyridazines, whereas their non-fluorinated analogs (H), with trans-configuration, easily cyclize to pyrazoles, but remain intact under Staudinger–diaza-Wittig
具有官能团(AlkO 2 C,CN 2)的顺式关系的3-(三氟甲基)取代的(F)2-乙烯基-2-重氮羰基化合物不进行1,5-电环化,但容易参与串联Staudinger-diaza-Wittig反应生成三氟甲基取代的哒嗪,而它们的非氟化类似物(H)具有反式构型,很容易环化成吡唑,但在Staudinger-diaza-Wittig反应条件下保持完整。H-和F反应性的差异-乙烯基重氮酮,乙烯基重氮乙酸酯和衍生的膦嗪显然是由AlkO 2 C和CN 2基团的不同立体化学排列引起的。