Diastereoselective synthesis of the 19-epi-C18–C25 segment of (−)-lasonolide A and an unusual inversion at C19
作者:Tomoyuki Yoshimura、Toshikazu Bando、Mitsuru Shindo、Kozo Shishido
DOI:10.1016/j.tetlet.2004.10.071
日期:2004.12
segment of (−)-lasonolide A was achieved using a 5-exo-trigonal mode of radical cyclization for the creation of the contiguous quaternary and tertiary stereogenic centers at C22 and C23 as the key reaction step. During the dehydration stage, it was found that an unusual inversion of configuration took place.
(-)-lasonolide A的19- epi -C 18 -C 25片段的非对映选择性结构是通过5-外-三角模式的自由基环化反应实现的,以在C 22和C处创建连续的四级和三级立体中心23作为关键反应步骤。在脱水阶段,发现构型发生了异常转变。