Diastereocontrol in the intramolecular cycloadditions of 2-substituted-erythro-3,4-isopropylidenedioxyhex-5-enenitrile oxides
摘要:
The influence of the 2-substituent on the diastereoselectivity of the intramolecular cycloadditions in a series of 2-substitute-erythro-3,4-isopropylidene-dioxyhex-5-enenitrile oxides, generated in situ from Selected sugar derivatives, was examined. (C) 1999 Elsevier Science Ltd. All rights reserved.
Diastereocontrol in the intramolecular cycloadditions of 2-substituted-erythro-3,4-isopropylidenedioxyhex-5-enenitrile oxides
摘要:
The influence of the 2-substituent on the diastereoselectivity of the intramolecular cycloadditions in a series of 2-substitute-erythro-3,4-isopropylidene-dioxyhex-5-enenitrile oxides, generated in situ from Selected sugar derivatives, was examined. (C) 1999 Elsevier Science Ltd. All rights reserved.
An efficient and highly diastereoselective synthetic approach to enantiomericallypure (−)-(1R,2R,3S,4R)- and (+)-(1S,2S,3R,4S)-4-hydroxyethylcyclopentane-1,2,3-triols is reported, which involves conversion of D-ribose or D-arabinose to (+)- or (−)-ethyl Z-4,5-isopropylidenedioxyhepta-2,6-dienoate, mercuration of the terminal double bond by mercury(II) acetate, followed by reductive radical cyclization