作者:Kazutake Hagiya、Natsuko Muramoto、Tomonori Misaki、Takashi Sugimura
DOI:10.1016/j.tet.2009.05.048
日期:2009.8
Di-2-methoxyethyl azodicarboxylate (DMEAD) is prepared in 65% yield in two steps as a crystalline solid. Use of DMEAD in the Mitsunobu reaction of a variety of alcohols with pronucleophiles results in good yields of the products under sufficient stereospecificity of inversion, as conventional diisopropyl azodicarboxylate (DIAD) does. Isolation of the product is, however, much easier with DMEAD than
分两个步骤以65%的产率制备偶氮二羧酸二-2-甲氧基乙酯(DMEAD),为结晶固体。与常规二偶氮偶氮二甲酸二异丙酯(DIAD)一样,在多种醇与亲核试剂的Mitsunobu反应中使用DMEAD可以在足够的立体定向特异性下获得良好的收率。但是,用DMEAD分离产品要比使用DIAD容易得多,因为用DMEAD生产的肼具有高度亲水性,并且可以通过简单地萃取到中性水中而完全分离。在通过过滤分离其他副产物三苯基膦氧化物后,有机层的纯化容易以高收率提供高纯度的产物。水层的浓缩产生肼,该肼可再用于制备DMEAD。