Synthesis of C13–C22 of amphidinolide T2 via nickel-catalyzed reductive coupling of an alkyne and a terminal epoxide
作者:Karen C. O'Brien、Elizabeth A. Colby、Timothy F. Jamison
DOI:10.1016/j.tet.2005.03.116
日期:2005.6
Abstract Several stereoselective routes to the synthesis of (1S,3R)-t-butyldimethyl-(1-methyl-3-oxiranyl-propoxy)-silane ( 13a ) were explored, and the use of Jacobsen's hydrolytic kinetic resolution to separate a mixture of diastereomeric epoxides was a key step in the shortest of these. As part of an approach to the total synthesis of amphidinolide T2 ( 2 ), this epoxide, corresponding to C17–C22
Synthesis of Amphidinolide T1 via Catalytic, Stereoselective Macrocyclization
作者:Elizabeth A. Colby、Karen C. O'Brie、Timothy F. Jamison
DOI:10.1021/ja039716v
日期:2004.2.1
Two nickel-catalyzed reductive coupling reactions of alkynes were instrumental in a modular, stereoselective synthesis of amphidinolide T1 (1). The C13-C21 fragment was prepared from two simple starting materials that were joined in a catalytic alkyne-epoxide fragment coupling operation, whereas an intramolecular aldehyde-alkyne reductive coupling simultaneously formed the final carbon-carbon bond of the macrocycle and established the C13 carbinol configuration with complete selectivity in the desired fashion.