Telescoping Reactions with Trifluorodiazoethane-Derived Aza-Wittig Reagents and Allenyl esters
作者:Fa-Guang Zhang、Jun-Liang Zeng、Yi-Qiang Tian、Yan Zheng、Dominique Cahard、Jun-An Ma
DOI:10.1002/chem.201801171
日期:2018.5.28
developed for the novel functionalization of allenyl esters. First, new phosphazenes derived from trifluorodiazoethane and phosphines were generated and reacted with allenyl esters to give unexpected α‐iminophosphoranes through the creation of C=P, C=N, and C−H bonds at the α‐, β‐, and γ‐carbon atoms, respectively, of the allenyl esters. The α‐iminophosphoranes did not react with aldehydes in a classic Wittig
开发了一种伸缩工艺,该工艺涉及将四种试剂(三氟重氮乙烷,膦,烯丙基酯和乙酸)连续添加到单个反应器中,以实现烯丙基酯的新型功能化。首先,生成了衍生自三氟重氮乙烷和膦的新磷腈并与烯丙基酯反应,通过在α-,β-和γ-上形成C = P,C = N和C-H键,产生了意想不到的α-亚氨基正膦烯丙基酯的碳原子。在经典的维蒂希反应中,α-亚氨基正膦不与醛反应,而是获得了β-烯氨基酯。反应的全部顺序提供了烯丙基酯的正式加氢肼化反应。该方法扩展到其他相关的重氮化合物,并用于制备新型5-吡唑啉酮衍生物。