Synthesis of Hexahydropyridazines by [4 + 2] Cycloaddition of Donor–Acceptor Cyclobutanes and <i>cis</i>-Diazenes
作者:Jackie Wu、Paul Winiarz、Dhwanish Patel、Johanna de Jong、David Tong、Tristan Chidley、Naresh Vemula、Brian L. Pagenkopf
DOI:10.1021/acs.orglett.0c00896
日期:2020.4.17
The GaCl3-catalyzed [4 + 2] cycloaddition between alkoxy- and aryl-activated donor–acceptor cyclobutane diesters and cis-diazene 1a (4-phenyl-1,2,4-triazoline-3,5-dione, PTAD) is disclosed. The reaction provides hexahydropyridazine derivatives as single diastereomers in good to excellent yields in most cases. The structural assignment of the cycloadduct 3b was unambiguously established by single-crystal
在烷氧基和芳基活化的供体-受体环丁烷二酯与顺式-二氮烯1a(4-苯基-1,2,4-三唑啉-3,5-二酮,PTAD)之间的GaCl 3催化的[4 + 2]环加成反应为披露。在大多数情况下,该反应提供的六氢哒嗪衍生物为单一非对映异构体,收率良好至极佳。通过单晶X射线衍射明确地确定了环加合物3b的结构分配。