phenethylamine derivatives, underwent a direct aromatic carbonylation to afford five- or six-membered benzolactams. In the carbonylation, the chelation effect or steric repulsion between Pd(II) and the meta-substituent in the ortho-palladation and the ring sizes of cyclopalladation products that were formed prior to carbonylation were found to generate good site selectivity and increase the reaction rate. In
α-C–H/N–H Annulation of Alicyclic Amines via Transient Imines: Preparation of Polycyclic Lactams
作者:Weijie Chen、Daniel Seidel
DOI:10.1021/acs.orglett.1c01125
日期:2021.5.7
Polycyclic lactams are prepared in a single operation from o-toluamides and cyclic amines in a process that involves transient cyclic imines, species that are conveniently obtained in situ from the corresponding lithium amides and simple ketone oxidants. Imines thus generated, such as 1-pyrroline and 1-piperideine, engage lithiated o-toluamides in a facile annulation process. Undesired side reactions
Radical cyclizations to quinolone and isoquinolone systems under oxidative and reductive conditions
作者:Yazmin M. Osornio、Luis D. Miranda、Raymundo Cruz-Almanza、Joseph M. Muchowski
DOI:10.1016/j.tetlet.2004.01.123
日期:2004.3
Radical cyclizations to quinolone and isoquinolone systems under Fenton-type and n-Bu3SnH-mediated conditions are described. For N-iodoalkylquinolones, ca. 3:1 mixtures of oxidative cyclization products at C-2, and unexpectedly at C-8, were obtained under both conditions. Five- or six-membered oxidative cyclization products were obtained from N-iodoalkylisoquinolones under Fenton-type conditions, whereas
Deacylation-aided C–H alkylative annulation through C–C cleavage of unstrained ketones
作者:Xukai Zhou、Yan Xu、Guangbin Dong
DOI:10.1038/s41929-021-00661-7
日期:——
on the aromaticcore and a tethered alkyl moiety provides a straightforward approach to access these scaffolds; however, such a strategy is often hampered by the need of special reactive groups and/or less compatible cyclization conditions. It would be synthetically appealing if a common native functional group can be used as a handle to enable a general C–H annulation with diverse aromatic rings.
Amidine and isothiourea derivatives, compositions containing them and
申请人:Astra Aktiebolag
公开号:US05929085A1
公开(公告)日:1999-07-27
There are provided novel compounds of formula (I) ##STR1## wherein X, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are as defined in the specification and optical isomers and racemates thereof and pharmaceutically acceptable salts thereof; together with processes for their preparation, compositions containing them and their use in therapy.