A 1,2-metallate rearrangement of the putative higher order cuprate 17 derived from reaction of the metallated dihydrofuran 15 with the homocuprate 16 occurred with clean inversion of configuration to give the alkenylcuprate 18. Methylation of 18 followed by five simple transformations completed the synthesis of the C16-C23 effector domain of the immunosuppressant FK-506.
通过
金属化的二氢
呋喃15与同杯16反应衍生出的假定高阶杯17发生了一个1,2-
金属迁移重排反应,配置得到了干净的反转,生成了烯基杯18。接着对18进行甲基化,并通过五个简单的转化步骤,完成了
免疫抑制剂FK-506的C16-C23效应域的合成。