Diastereoselective cascade reactions toward substituted diazaindeno[2,1-α]phenanthrenes
作者:Xiaoyu Wu、Huihui Fang、Qin Liu、Linlin Nie、Jie Chen、Weiguo Cao、Gang Zhao
DOI:10.1016/j.tet.2011.07.050
日期:2011.9
A cascade sequence between cyclic hemiacetals and tryptamines was developed, which provided efficient access to highly substituted diazaindeno[2,1-α]phenanthrenes in moderate to good yields with high diastereoselectivities and good to excellent enantioselectivities. Hemiacetals were prepared by asymmetric organocatalyzed conjugate addition of cyclic 1,3-diketones to α,β-unsaturated aldehydes. Hemiacetals
环状半缩醛和色胺之间的级联序列被开发出来,它提供了以中等到良好的产率,高非对映选择性和良好到优异的对映选择性有效获得高取代的二氮杂茚并[2,1- α ]菲的途径。通过将环状1,3-二酮不对称地有机催化共轭加成到α,β-不饱和醛上来制备半缩醛。检查具有各种R 1(芳族和脂族)的半缩醛的级联序列。