Inter- and Intramolecular Differentiation of Enantiotopic Dioxane Acetals through Oxazaborolidinone-Mediated Enantioselective Ring-Cleavage Reaction: Kinetic Resolution of Racemic 1,3-Alkanediols and Asymmetric Desymmetrization of <i>M</i><i>eso</i>-1,3-polyols
Acetals derived from racemic 1,3-alkanediols undergo kinetic resolution in chiral oxazaborolidinone-mediated ring-cleavage reaction with nucleophiles such as enol silanes and allylic silanes. Enantioselectivity of the reaction is affected by nucleophiles, the N-sulfonyl groups of oxazaborolidinones, and the substituents attached to the acetal carbon. For disubstituted acetals rac-1 and for trisubstituted
In Silico Inspired Total Synthesis of (−)-Dolabriferol
作者:Russell H. Currie、Jonathan M. Goodman
DOI:10.1002/anie.201109080
日期:2012.5.7
Going retro: The diazabicycloundecane‐induced retro‐Claisen rearrangement of a linear precursor serves as the key step to form the hindered ester of the polypropionate dolabriferol (1, see scheme, PMB=p‐methoxybenzyl, PMP=p‐methoxyphenyl, TES=triethylsilyl). The rearrangement is thought to mimic the biosynthetic formation of 1.