Methods for pyranoannulation: an approach to a new class of polyethers
摘要:
Several methods have been developed for fusing a pyran ring to an existing pyran ring structure such that the ring oxygens assume a vicinal (ethylene glycol) relationship. The tricyclic structure 13, a previously unknown substance, was prepared through a combination of these methods.
Methods for pyranoannulation: an approach to a new class of polyethers
摘要:
Several methods have been developed for fusing a pyran ring to an existing pyran ring structure such that the ring oxygens assume a vicinal (ethylene glycol) relationship. The tricyclic structure 13, a previously unknown substance, was prepared through a combination of these methods.
Neighboring‐Group Participation by C‐2 Acyloxy Groups: Influence of the Nucleophile and Acyl Group on the Stereochemical Outcome of Acetal Substitution Reactions
作者:Yuge Chun、Wouter A. Remmerswaal、Jeroen D. C. Codée、K. A. Woerpel
DOI:10.1002/chem.202301894
日期:2023.10.13
Neighboring-group participation by C-2 acyloxy groups can control the 1,2-trans stereoselectivity of acetal substitution reactions with the employment of strong nucleophiles. 1,2-Trans selectivity increases with decreased electron-donating ability of the acyloxy groups at C-2.