Revisiting the Armed−Disarmed Concept: The Importance of Anomeric Configuration in the Activation of S-Benzoxazolyl Glycosides
摘要:
The unexpectedly high reactivity of a (2-benzoxazolyl) per-O-benzoyl-beta-D-thioglucoside and related donors in reactions promoted by copper(II) trifluoromethanesulfonate is revealed, by comparison with the unreactive alpha-anomer, to be the result of neighboring group participation. Revision of the armed-disarmed concept for glycosyl donors is not required.
Revisiting the Armed−Disarmed Concept: The Importance of Anomeric Configuration in the Activation of <i>S</i>-Benzoxazolyl Glycosides
作者:David Crich、Ming Li
DOI:10.1021/ol701466u
日期:2007.10.1
The unexpectedly high reactivity of a (2-benzoxazolyl) per-O-benzoyl-beta-D-thioglucoside and related donors in reactions promoted by copper(II) trifluoromethanesulfonate is revealed, by comparison with the unreactive alpha-anomer, to be the result of neighboring group participation. Revision of the armed-disarmed concept for glycosyl donors is not required.