conformationally constrained 10-memberedcyclic diamide was designed and synthesized. Conformational analysis suggested that the 9-membered ring formation was preferred to the direct formation of 10-membered ring. On the basis of the prediction, lactonization of 9-membered lactone, followed by intramolecular ester–amide transformation afforded the desired 10-memberedcyclic diamide.
Sequential Asymmetric Hydrogenation of Symmetric Bis-Cinnamic Acid Derivatives: Syntheses of the <i>C</i><sub>2</sub>-Symmetric Core Units of HIV Protease Inhibitors
New Entry to Convertible Isocyanides for the Ugi Reaction and Its Application to the Stereocontrolled Formal Total Synthesis of the Proteasome Inhibitor Omuralide
作者:Cynthia B. Gilley、Matthew J. Buller、Yoshihisa Kobayashi
DOI:10.1021/ol701446y
日期:2007.8.1
access to pyroglutamic acids culminated in the formal total synthesis of the proteasome inhibitor omuralide featuring a stereocontrolledUgireaction. Indole-isocyanide was named after the facilitation of hydrolysis of the resulting 2-(2,2-dimethoxyethyl)anilide via an N-acylindole intermediate obtained by the Ugi multicomponent condensation reaction followed by the indole formation.