A new and efficient desymmetrisation of succinic and glutaric cyclic meso-anhydrides is described, providing excellent yields and diastereoselectivities in most cases. Derivatisation of the desymmetrised products is demonstrated by their conversion into mono-protected 1,4-diols. General synthetic utility of the method is established by its application towards a key fragment in the total synthesis of the immunosuppressant antitumour natural product, rapamycin.
本文描述了
琥珀酸和谷
氨酸环状内消旋酐的一种新的高效去对称化方法,在大多数情况下提供了优异的产率和非对映选择性。通过将去对称化产物转化为单保护的1,4
-二醇,展示了它们的衍生化能力。通过该方法在免疫抑制抗肿瘤
天然产物雷帕霉素的全合成中关键片段的应用,证明了其普遍的合成实用性。