Chemoenzymatic Total Synthesis and Structural Diversification of Tylactone-Based Macrolide Antibiotics through Late-Stage Polyketide Assembly, Tailoring, and C—H Functionalization
作者:Andrew N. Lowell、Matthew D. DeMars、Samuel T. Slocum、Fengan Yu、Krithika Anand、Joseph A. Chemler、Nisha Korakavi、Jennifer K. Priessnitz、Sung Ryeol Park、Aaron A. Koch、Pamela J. Schultz、David H. Sherman
DOI:10.1021/jacs.7b02875
日期:2017.6.14
Polyketide synthases (PKSs) represent a powerful catalytic platform capable of effecting multiple carbon-carbon bond forming reactions and oxidation state adjustments. We explored the functionality of two terminal PKS modules that produce the 16-membered tylosin macrocycle, using them as biocatalysts in the chemoenzymatic synthesis of tylactone and its subsequent elaboration to complete the first total
聚酮合酶 (PKS) 是一种强大的催化平台,能够影响多个碳-碳键形成反应和氧化态调整。我们探索了产生 16 元泰乐菌素大环的两个末端 PKS 模块的功能,将它们用作泰内酯化学酶法合成中的生物催化剂,并在随后的阐述中完成了 juvenimicin、M-4365 和 rosamicin 类的首次全合成通过后期多样化开发大环内酯类抗生素。采用合成化学来生成可被倒数第二个 JuvEIV PKS 模块的 juvenimicin (Juv) 酮合酶接受的 tylactone 六酮链延长中间体。六酮化合物在体外通过两个完整的模块(JuvEIV 和 JuvEV)进行处理,其催化两个酮化合物单元的延伸和官能化,然后将所得八酮化合物环化成丁内酯。大环内酯化后,结合体内糖基化、选择性体外细胞色素 P450 介导的氧化和化学氧化,以少至 15 个线性步骤(总共 21 个)完成一系列大环内酯天然产物的可扩展构建。产率为