Gas–solid reactions of single crystals: A study of the reaction of bromine with single crystals of trans-cinnamic acid and a range of its derivatives by infrared and Raman microspectroscopy
Palladium-catalyzed [2+1+1] annulation of norbornenes with (z)-bromostyrenes: synthesis of bismethylenecyclobutanes via twofold C(sp<sup>2</sup>)–H bond activation
作者:Jiangang Mao、Weiliang Bao
DOI:10.1039/c4cc06545j
日期:——
The first Pd-catalyzed intermolecular [2+1+1] annulation reaction of (Z)-bromostyrene derivatives and norbornenes has been realized. Bismethylenecyclobutane derivatives were obtained with high yields. The domino coupling reaction involves a double Heck-type coupling process, twofold C(sp(2))-H bond activation and formation of three carbon-carbon bonds.
Synthesis and fluorescence of the new environment-sensitive fluorophore 6-chloro-2,3-naphthalimide derivative
作者:Alan R. Katritzky、Sevil Ozcan、Ekaterina Todadze
DOI:10.1039/c000684j
日期:——
Convenient and efficient synthesis of a new environmentally sensitive chlorine-substituted 2,3-naphthalimide-based fluorophore is reported. Benzotriazole carboxyl group activation of the 6-chloro-fluorophore enabled quick labeling of free and Fmoc-protected amino acids. The photophysical properties of the compounds obtained include high quantum yields in solvents of different polarity: water, methanol, acetonitrile and hexane.
Engaging Alkenyl Halides with Alkylsilicates via Photoredox Dual Catalysis
作者:Niki R. Patel、Christopher B. Kelly、Matthieu Jouffroy、Gary A. Molander
DOI:10.1021/acs.orglett.6b00024
日期:2016.2.19
Single-electron transmetalation via photoredox/nickel dual catalysis provides the opportunity for the construction of Csp3–Csp2 bonds through the transfer of alkyl radicals under very mild reaction conditions. A general procedure for the cross-coupling of primary and secondary (bis-catecholato)alkylsilicates with alkenyl halides is presented. The developed method allows not only alkenyl bromides and
Palladium(0)-Catalyzed Methylcyclopropanation of Norbornenes with Vinyl Bromides and Mechanism Study
作者:Jiangang Mao、Hujun Xie、Weiliang Bao
DOI:10.1021/acs.orglett.5b01603
日期:2015.8.7
cycloadditions of vinyl bromides to norbornenes catalyzed by Pd(OAc)2/PPh3 in the presence of CH3ONa and CH3OH has been established. A methylcyclopropane subunit was installed by a 3-fold domino procedure involving a key protonation course. Preliminary deuterium-labeling studies revealed that the proton came from methyl of CH3OH and also exposed an additional hydrogen/deuterium exchange process. These two
Palladium(0)-Catalyzed Methylenecyclopropanation of Norbornenes with Vinyl Bromides
作者:Jiangang Mao、Weiliang Bao
DOI:10.1021/ol500829t
日期:2014.5.16
Highly strained methylenecyclopropane derivatives have been achieved via a novel and efficient Pd(0)-catalyzed domino reaction. The formal [2 + 1] cycloaddition reaction of vinyl bromides to norbornenes involves a Heck-type coupling and a C(sp2)–H bond activation.