A method is described for the synthesis of cis-2,6-disubstituted tetrahydropyranols related to ring A of ambruticin S. An organocatalytic and metal-free aldol condensation was utilized as a key step between appropriate carbonyl-containing precursors resulting in high diastereoselection and 24% overall yield for seven steps.
本研究介绍了一种合成与安鲁替嗪 S 的环 A 有关的顺式-2,6-二取代
四氢吡喃醇的方法。作为关键步骤,在适当的含羰基前体之间采用了有机催化和无
金属醛醇缩合,结果非对映选择性高,七个步骤的总收率为 24%。