The enantioselective synthesis of bistramide A has been achieved with a longest linear sequence of 18 steps. The synthetic strategy involves the use of a distereoselective glycolate alkylation, an aldol addition of a chlorotitanium enolate of N-acylthiazolidinthione, and a Sharpless asymmetric epoxidation to synthesize the three key fragments.
Bistramide A 的对映选择性合成已通过最长的 18 步线性序列实现。合成策略包括使用非对映选择性乙醇酸烷基化、N-酰基噻唑烷硫酮的氯钛烯醇化物的羟醛加成和 Sharpless 不对称环氧化来合成三个关键片段。
Synthesis of Bistramide A
作者:Alexander V. Statsuk、Dong Liu、Sergey A. Kozmin
DOI:10.1021/ja046588h
日期:2004.8.1
We have developed an efficient and highly stereocontrolled synthesis of bistramide A, a selective activator of protein kinase C isotype delta. Our synthetic strategy featured a novel bidirectional approach for spiroketal construction based on the ring-opening/cross-metathesis sequence employing a highly strained cyclopropenone acetal. The synthesis afforded the final target with the longest linear sequence of 15 steps and provided unambiguous structural determination of bistramide A, including assignment of the previously unknown C(37) stereochemistry.