Oxetanes in Drug Discovery: Structural and Synthetic Insights
作者:Georg Wuitschik、Erick M. Carreira、Björn Wagner、Holger Fischer、Isabelle Parrilla、Franz Schuler、Mark Rogers-Evans、Klaus Müller
DOI:10.1021/jm9018788
日期:2010.4.22
of metabolic degradation in most cases. The incorporation of an oxetane into an aliphatic chain can cause conformational changes favoring synclinal rather than antiplanar arrangements of the chain. Additionally spirocyclic oxetanes (e.g., 2-oxa-6-aza-spiro[3.3]heptane) bear remarkable analogies to commonly used fragments in drugdiscovery, such as morpholine, and are even able to supplant the latter
This paper describes a novel palladium-catalyzedoxidativecyclization of bromoalkynes with N-allylamines via cascade formation of C-N and C-C bonds. During this process, the bromine atom was retained to form 3-bromo-pyrroles, which can undergo the subsequent structural modifications.
A nickel-catalyzed aminofluoroalkylative cyclization of unactive alkenes with iododifluoromethyl ketones was developed to construct versatile difluoroalkylated Nitrogen-containing heterocycles including aziridines, pyrrolidines and piperidines in moderate to high yields. This method features a broad substrate scope and has been demonstrated on gram scale.
A multitalented system: N‐Migratory oxytrifluoromethylation and one‐pot three‐component reactions of allylamines as well as the aminotrifluoromethylation of alkenyl amines all proceeded efficiently in the presence of the Togni reagent (1) and CuI to afford a variety of β‐trifluoromethylamine derivatives (see scheme).
Palladium-Catalyzed Oxidative Carbonylation of<i>N</i>-Allylamines for the Synthesis of β-Lactams
作者:Wu Li、Chao Liu、Heng Zhang、Keyin Ye、Guanghui Zhang、Wangzheng Zhang、Zhengli Duan、Shuli You、Aiwen Lei
DOI:10.1002/anie.201309081
日期:2014.2.24
β‐Lactam scaffolds are considered to be ideal building blocks for the synthesis of nitrogen‐containing compounds. A new palladium‐catalyzedoxidativecarbonylation of N‐allylamines for the synthesis of α‐methylene‐β‐lactams is reported. DFT calculations suggest that the formation of β‐lactams via a four‐membered‐ring transition state is favorable.