Synthesis and molecular structure of 3-(2-benzyloxy-6-hydroxyphenyl)-5-styrylpyrazoles. Reaction of 2-styrylchromones and hydrazine hydrate
作者:Diana C.G.A. Pinto、Artur M.S. Silva、JoséA.S. Cavaleiro、Concepción Foces-Foces、Antonio L. Llamas-Saiz、Nadine Jagerovic、José Elguero
DOI:10.1016/s0040-4020(99)00546-3
日期:1999.8
3-(2-Benzyloxy-6-hydroxyphenyl)-5-styrylpyrazoles 7a-e were prepared from the reaction of 2-styrylchromones and hydrazine hydrate. 3-(2-Benzyloxy-6-hydroxyphenyl)-5-(2-phenylethyl)-pyrazoles 8a,d,e and 3-(2-benzyloxy-β,6-dihydroxystyryl)-5-aryl-2-pyrazolines 9a-e were also obtained as by-products. The crystal and molecular structure of two 3-(2-benzyloxy-6-hydroxyphenyl)-5-styrylpyrazoles 7a,b have
由2-苯乙烯基色酮与水合肼反应制得3-(2-苄氧基-6-羟基苯基)-5-苯乙烯基吡唑7a-e。3-(2-苄氧基-6-羟基苯基)-5-(2-苯乙基)-吡唑8a,d,e和3-(2-苄氧基-β,6-二羟基苯乙烯基)-5-芳基-2-吡唑啉9a- e也作为副产物获得。两种3-(2-苄氧基-6-羟基苯基)-5-苯乙烯基吡唑7a,b的晶体和分子结构由X射线分析确定。尽管氢被苯乙烯基部分双键上的甲基取代似乎是一个很小的扰动,但它在仅存在一个构象异构体的晶体堆积中产生了剧烈的变化。OH基团是分子内氢键的供体,NH基团是通过分子间氢键形成链的原因。