Reactions of Hindered α-Bromo- and Hydroxysuccinic Acids<sup>1a,b</sup>
作者:Wyman R. Vaughan、Kirby M. Milton
DOI:10.1021/ja01142a026
日期:1952.11
Use of the Potassium Ion as a Template for the Selective Derivatization of the Antibiotic X-206
作者:Anthony C. O'Sulliva、Fritz Struber、Steven V. Ley
DOI:10.1021/jo9903151
日期:1999.8.1
The templating effect of potassium ions on the ionophore antibiotic X-206 (1) ensured that most of the hydroxy, hemiacetal, and ether groups were involved in encapsulation of the metal atom, which allowed a selective derivatization at the unbound C(22) position. The mechanism of acylation at, C(22) was investigated and the aquired knowledge used to achieve selective reactions on the benzyl ester 8 using a similar metal template protection.
Bestimmung und Isolierung von schwer acylierbaren Alkoholen mittles Methoxalsäure-anhydrid