Palladium-Catalyzed Aerobic Oxidative Cyclization of Aliphatic Alkenyl Amides for the Construction of Pyrrolizidine and Indolizidine Derivatives
作者:Dan Yang、Kai-Yip Lo、Liu Ye
DOI:10.1055/s-0036-1588502
日期:2017.8
An efficient palladium-catalyzed aerobic oxidative cyclization has been developed to synthesize a variety of pyrrolizidine and indolizidine derivatives from simple aliphatic alkenyl amides in moderate to good yields. The reaction features the capability of accessing various N-heterocycles and the use of molecular oxygen (1 atm) as the green oxidant.
The discovery of potent, selective, and orally bioavailable PDE9 inhibitors as potential hypoglycemic agents
作者:Michael P. DeNinno、Melissa Andrews、Andrew S. Bell、Yue Chen、Cynthia Eller-Zarbo、Nan Eshelby、John B. Etienne、Dianna E. Moore、Michael J. Palmer、Michael S. Visser、Li J. Yu、William J. Zavadoski、E. Michael Gibbs
DOI:10.1016/j.bmcl.2009.03.024
日期:2009.5
lead, the sequential use of parallel medicinal chemistry and directed synthesis led to the discovery of potent, highly selective, and orally bioavailable PDE9 inhibitors. The availability of these tools allowed for a thorough evaluation of the therapeutic potential of PDE9 inhibition.
Metal-Free Oxidative Cyclization of Urea-Tethered Alkenes with Hypervalent Iodine
作者:Brian M. Cochran、Forrest E. Michael
DOI:10.1021/ol8022165
日期:2008.11.6
A metal-free oxidative cyclization of ureas onto unactivated alkenes using iodosylbenzene and an acid promoter is described. The products isolated are predominantly bicyclic isoureas resulting from an intramolecular oxyamination reaction. The acid type and urea substitution have a strong effect on the product formed. A variety of substrates form the isourea with high diastereoselectivity via syn addition
Rhodium-catalysed reactions of 5-aminopent-1-enes with carbon monoxide and hydrogen give 2-piperidinone derivatives in high yields under mild conditions. Reaction of allylamine under similar conditions gave exclusively 2-pyrrolidone in high yield and reactions of 4-aminobut-1-enes gave mixtures of 2-piperidinones and 2-pyrrolidinones. The role of the hydrogen in these reactions is discussed.