作者:Chao-Jun Tang、Yikang Wu
DOI:10.1016/j.tet.2007.03.144
日期:2007.6
detail. The C-7, C-8, and C-9 stereogenic centers in the target molecule were derived from d-arabinose. The configuration of the allene axis was controlled at the bromoallenation step by the C-10 configuration of the precursor. An unexpected yet very interesting phenomenon was observed with the bromoallenation, where the α-isomer of the propargylic alcohol 31 was entirely resistant to the conditions
详细介绍了全合成cepacin A的工作。靶分子中的C-7,C-8和C-9立体中心来自d-阿拉伯糖。通过前体的C-10构型,在溴烯化步骤中控制异戊二烯轴的构型。溴代缩微反应观察到了意想不到但非常有趣的现象,其中炔丙醇31的α-异构体对它的β对立物完全有效的条件具有抵抗力。该问题最终通过根据构象分析获得的线索仔细调整相邻基团的大小而得以解决。在Sonogashira条件下,以EtOAc为溶剂,通过将TMS保护的二炔与适当的溴丙二烯偶联,将二炔部分掺入分子框架中。在此步骤中使用其他溶剂会导致完全失败。