Highly Regioselective Aromatic C–H Allylation of <i>N</i>-(Arylmethyl)sulfonimides with Allyl Grignard Reagents Involving Benzylic C–N Cleavage
作者:Meng-Zeng Zhu、Dong Xie、Shi-Kai Tian
DOI:10.1021/acs.orglett.1c02437
日期:2021.9.3
C–H functionalization of benzyl electrophiles with nucleophiles via palladium-catalyzed benzylic C–N cleavage. A range of N-(1-naphthylmethyl)sulfonimides, N-(2-thienylmethyl)sulfonimides, and N-(2-furanylmethyl)sulfonimides smoothly underwent palladium-catalyzed aromatic C–H allylation with allyl Grignard reagents at roomtemperature, delivering structurally diverse substituted 1-allylnaphthalenes and
Preparation of naphthaldehydes by cerium(IV)ammonium nitrate oxidation of methylnaphthalenes
作者:Leiv K. Sydnes、Ivan C. Burkow、Sissel H. Hansen
DOI:10.1016/s0040-4020(01)91375-4
日期:1985.1
Naphthalenes with an Me group in the 1-position gave aldehydes in good to excellent yields when oxidized with cerium(IV) ammoniumnitrate (CAN) in 50% HOAc at 85°. Under the same conditions methylnaphthalenes with no Me group in a peri position gave aldehydes in fair yields but also significant amounts of 1,4-naphthoquinone.
Aiming to introduce this smallest alkyl handle, a highly regioselective peri- and ortho-C–H methylation of 1-naphthaldehyde by using a transient ligand strategy has been developed. A series of methyl-substituted naphthalene frameworks have been prepared in moderate to excellent yields. Mechanistic studies demonstrate that peri-methylation is controlled by the higher electronic density of the peri-position
The present invention relates to in vivo imaging and radiotherapeutic methods and agents which target the enzyme aldehyde dehydrogenase (ALDH) and that are suitable for the in vivo imaging of tumours and treatment of cancer.