the C(1)-C(11) fragment 4 of peloruside A has been accomplished via a stereoselective double allylboration and an intramolecular epoxide opening to provide the functionally dense C(3)-C(11) segment 14. A glycolate aldol reaction was then employed to introduce the remaining stereocenters at C(2)-C(3). [reaction: see text]
球
果甙A的C(1)-C(11)片段4的高度立体选择性合成是通过立体选择性
双烯丙基硼化和分子内
环氧化物开口完成的,以提供功能上密集的C(3)-C(11)片段14。然后采用
乙醇酸酯羟醛反应在C(2)-C(3)处引入其余的立体中心。[反应:看文字]