Family-level stereoselective synthesis and biological evaluation of pyrrolomorpholine spiroketal natural product antioxidants.

ABSTRACT: The pyranose spiroketal natural products pollenopyrroside A and shensongine A (also known as xylapyrroside A, ent-capparisine B) have been synthesized by stereoselective spirocyclizations of a common C1-functionalized glycal precursor. In conjunction with our previously reported syntheses of the corresponding furanose isomers, this provides a versatile family-level synthesis of the pyrrolomorpholine spiroketal natural products and analogues. In rat mesangial cells, hyperglycemia-induced production of reactive oxygen species, which is implicated in diabetic nephropathy, was inhibited by pollenopyrroside A and shensongine A with mid-μM IC₅₀ values, while unnatural C2-hydroxy analogues exhibited more potent, sub-μM activity.

SUBMITTER: Verano AL 

PROVIDER: S-EPMC5571482 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature