Total Synthesis and Glycosidase Inhibition Studies of (-)-Gabosine J and Its Derivatives
作者:Adiyala Vidyasagar、Kana M. Sureshan
DOI:10.1002/ejoc.201301782
日期:2014.4
The total syntheses of (–)-gabosine J and its two gabosinol derivatives, the reduced forms of (–)-gabosine J, were achieved by a chiral pool strategy that started from inexpensive and readily available D-mannitol. The desymmetrization of the C2-symmetric tri-O-isopropylidene mannitol through a H2SO4/silica mediated hydrolysis of one of the two terminal ketals and a ring-closing methathesis (RCM) of
Serendipitous Synthesis and Configurational Assignment of (-)-Gabosine J
作者:Tony Shing、Y. Chen、Ho Wu
DOI:10.1055/s-0031-1290402
日期:2012.7
2-epi-Gabosine I, unambiguously synthesized from benzyl D-mannopyranoside in nine steps with 34% overall yield, has been shown to be identical to gabosine J by NMR spectral analysis, thereby indicating that the relative stereochemistry of gabosine J was incorrectly determined formerly as a syn-triol. The relative and absolute configurations of (-)-gabosine J are now revised and confirmed as (2S,3S,4R)-trihydroxy-5-hydroxymethylcyclohex-5-en-1-one. Since the specific rotation of the natural product has not been recorded, the absolute configuration of natural gabosine J is either (-)-gabosine J or its enantiomer.
Bio-inspired synthesis of rare and unnatural carbohydrates and cyclitols through strain driven epimerization
作者:Raja Mohanrao、Aromal Asokan、Kana M. Sureshan
DOI:10.1039/c4cc00868e
日期:——
Bio-inspired isomerization of carbohydrates and cyclitols to their rare and unnatural isomers, through strain-driven epimerization of trans-ketals to cis-ketals, is introduced.