Palladium‐Catalysed Cyclisation of
<i>N</i>
‐Alkynyl Aminomalonates
作者:Wilfried Hess、Jonathan W. Burton
DOI:10.1002/chem.201001951
日期:2010.11.2
Go around in (hetero)cycles! The palladium‐catalysed tandem cyclisation/coupling reaction of alkynyl‐ and alkenyl‐substituted aminomalonates leads to highly functionalised pyrrolidines and piperidines in good yield (see scheme). The reaction allows efficient access to a broad range of synthetically valuable building blocks.
Multifunctional 1,3-diphenylguanidine for the carboxylative cyclization of homopropargyl amines with CO<sub>2</sub> under ambient temperature and pressure
could be utilized for the carboxylative cyclization of homopropargyl amines with CO2 under ambient temperature and pressure, in combination with AgSbF6, which enabled the synthesis of both chiral and achiral 2-oxazinones efficiently. A mechanistic study revealed that the multi-functionality of DPG is critical to the success of the reaction.
Amine-Directed Hydroboration: Scope and Limitations
作者:Matthew Scheideman、Guoqiang Wang、Edwin Vedejs
DOI:10.1021/ja0774663
日期:2008.7.1
Iodine activation induces intramolecular hydroboration of homoallylic and bis-homoallylic amineboranes with good to excellent control of regiochemistry compared to control experiments using excess THF•BH3. Deuterium labeling and other evidence confirm that the iodine-induced hydroboration reaction of homoallylic amineboranes occurs via an intramolecular mechanism equivalent to the classical 4-center
An efficient and general iodocarbamation of homopropargyl N-Cbz carbamates was developed using iodine as the electrophilic agent. This regio- and stereoselective cyclization yields (E)-6-iodomethylen-oxazinan-2-ones, which can be further transformed through palladium cross-coupling reactions followed by hydrogenation, to produce 1,3-oxazinan-2-ones.