Palladium-catalyzed heteroallylation of unactivated alkenes – synthesis of citalopram
作者:Joanne F. M. Hewitt、Lewis Williams、Pooja Aggarwal、Craig D. Smith、David J. France
DOI:10.1039/c3sc51222c
日期:——
A palladium-catalyzed difunctionalization of unactivated alkenes with tethered nucleophiles is reported. The versatile reaction occurs with simple allylic halides and can be carried out under air. The methodology provides rapid access to a wide array of desirable heterocyclic targets, as illustrated by a concise synthesis of the widely prescribed antidepressantcitalopram.
Dynamics and a Unified Understanding of Competitive [2,3]- and [1,2]-Sigmatropic Rearrangements Based on a Study of Ammonium Ylides
作者:Bibaswan Biswas、Sean C. Collins、Daniel A. Singleton
DOI:10.1021/ja4128289
日期:2014.3.12
The [2,3]- and [1,2]-sigmatropic rearrangements of ammoniumylides are studied by a combination of experimental, standard computational, and dynamic trajectory methods. The mixture of concerted [2,3] rearrangement and bond cleavage observed experimentally is accounted for by the outcome of trajectories passing through the formal [2,3] rearrangement transition state. In this way the bond cleavage is