Ruthenium-Catalyzed Alkyne−Propargyl Alcohol Addition. An Asymmetric Total Synthesis of (+)-α-Kainic Acid
作者:Barry M. Trost、Michael T. Rudd
DOI:10.1021/ol034241y
日期:2003.5.1
A novel route to the neuroexcitatory amino acid, kainic acid, is developed. The key concept derives from a ruthenium-catalyzed cycloisomerization of a tethered alkyne-propargyl alcohol to form a cyclic 2-vinyl-1-acyl compound. A single stereocenter introduced by an asymmetric reduction of a ketone sets the stage for all the other stereocenters. A novel 1,6-addition of silyl cuprate serves to install
Ruthenium-Catalyzed Cycloisomerizations of Diynols
作者:Barry M. Trost、Michael T. Rudd
DOI:10.1021/ja043097o
日期:2005.4.1
[CpRu(CH(3)CN)(3)]PF(6). The formation of five- and six-memberedrings is possible using this methodology. Secondary diynols react to form single geometrical isomeric dienones and -als. Primary diynols undergo a cycloisomerization as well as a hydrative cyclization process. The utility of primary diynol cycloisomerization is demonstrated in a synthesis of (+)-alpha-kainic acid.