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.
Enantioselective Diels–Alder Reaction of α-(Acylthio)acroleins: A New Entry to Sulfur-Containing Chiral Quaternary Carbons
作者:Akira Sakakura、Hiroki Yamada、Kazuaki Ishihara
DOI:10.1021/ol300921f
日期:2012.6.15
A catalytic and enantioselectiveDiels–Alderreaction of α-(carbamoylthio)acroleins induced by an organoammonium salt of chiral triamine is described. α-(Carbamoylthio)acroleins are designed and synthesized as new sulfur-containing dienophiles for the first time. The Diels–Alderreaction affords chiral tertiary thiol precursors with up to 91% ee.
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.