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.
Highly selective N-allylation of anilines under microwave irradiation
作者:Meiyu Liu、Xie Wang、Xiaoliang Sun、Wei He
DOI:10.1016/j.tetlet.2014.03.044
日期:2014.4
for the preparation of a variety of mono- and bis-allylated anilines via the reaction of allyl bromide with a wide range of anilines undermicrowaveirradiation is described. This approach allows use of mild conditions and short reaction times to give high selectivities and excellent yields.
Defluorinative Carboimination of Trifluoromethyl Ketones
作者:Xiaolong Zhang、Yongquan Ning、Zhaohong Liu、Shuang Li、Giuseppe Zanoni、Xihe Bi
DOI:10.1021/acscatal.2c02434
日期:2022.8.5
intramolecular cascade process by integrating successive cleavage of the C–Fbond and formation of C–C and C═N bonds on a single molecule entity, which differs relevantly from the stepwise mechanism of reported carbodefluorination of CF3 groups. Mechanistic studies disclose that silver catalysis plays a critical role, particularly in the stages of C–Fbondcleavage and aza-Claisen rearrangement.
An efficient catalytic strategy toward the synthesis of N-substituted 3-methylindoles from inactive o-dihaloarenes and N-allylamines was developed by using a 1,3-bis(2,6-diisopropylphenyl)acenaphthoimidazol-2-ylidene (AnIPr)-ligated oxazoline palladacycle. It enabled a very broad substrate scope tolerating different functional groups, electronic properties, and steric bulkiness and afforded desired
meta-Thermocycloadditions of benzene rings was realized for the first time. Distinct to the meta-photocycloadditions, this reaction was proposed to proceed via [4π+2π] cycloadditions of Wheland intermediates from the electrophilic dearomatization of benzene rings. A broad spectrum of readily available C(sp2)-rich aniline-tethered enynes were transformed into C(sp3)-rich 3D complex polycyclic architectures