(+)-Sorangicin A Synthetic Studies. Construction of the C(1−15) and C(16−29) Subtargets
作者:Amos B. Smith、Richard J. Fox、John A. Vanecko
DOI:10.1021/ol051119l
日期:2005.7.1
[structure: see text] Effective stereocontrolled syntheses of subtargets (-)-2 and (-)-4, comprising respectively the C(16-29) and C(1-15) tetrahydropyran and dihydropyran moieties of the potent antibiotic (+)-sorangicin A (1), have been achieved. The cornerstone for the synthesis of (-)-2 involved an aldol tactic exploiting 1,4-induction, followed in turn by an acid-mediated cyclization/ketalization
[结构:参见正文]有效的立体控制合成的亚靶标(-)-2和(-)-4,分别包含强效抗生素(+)的C(16-29)和C(1-15)四氢吡喃和二氢吡喃部分-sorangicin A(1)已实现。合成(-)-2的基石涉及利用1,4-诱导的羟醛策略,然后依次由TMSOTf促进酸介导的环化/缩酮化和氢硅烷还原,而(-)-4的构建则需要立体选择性共轭加成/α-加氧序列。