Palladium-catalyzed intermolecular alkylation of enamides with [small alpha]-bromo carbonyls was developed. Under mild reaction conditions, various cyclic and acyclic enamides reacted well with [small alpha]-bromo carbonyls to afford the corresponding multi-substituted alkene...
Carbon–carbon bond formation by radical addition–fragmentation reactions of O-alkylated enols
作者:Yudong Cai、Brian P. Roberts、Derek A. Tocher、Sarah A. Barnett
DOI:10.1039/b407215b
日期:——
opening of the cyclopropyldimethylcarbinyl radical, the ketene acetal H2C=C(OCMe2C3H5-cyclo)OTBS reacts with two molecules of N-methyl- or N-phenyl-maleimide to bring about [3 + 2] annulation of onemolecule of the maleimide, and then to link the bicyclic moiety thus formed to the second molecule of the maleimide via an alkylation-carboxymethylation reaction.
Organo-photoredox-Catalyzed Atom-Transfer Radical Substitution of Alkenes with α-Carbonyl Alkyl Halides
作者:Goki Hirata、Taisei Shimada、Takashi Nishikata
DOI:10.1021/acs.orglett.0c03359
日期:2020.11.20
(ATRS) and carboesterification reaction of alkenes with alkyl halides has been developed using PTH as the organo-photoredox catalyst. Two types of products were obtained, depending on the additive and solvent used during the reaction. Primary, secondary, and tertiary alkyl halides reacted to give the ATRS products. This protocol has several advantages: it requires mild reaction conditions and a low catalyst
The present invention relates to compounds of formula (I):
and pharmaceutically acceptable salt thereof, wherein X
1
to X
4
, R
1
to R
4
, A, B, D and m are as defined herein. The invention also relates to pharmaceutical compositions comprising these compounds, methods of using these compounds in the treatment of various diseases and disorders, processes for preparing these compounds and intermediates useful in these processes.
A Pyridine-Based Donor–Acceptor Molecule: A Highly Reactive Organophotocatalyst That Enables the Reductive Cleavage of C–Br Bonds through Halogen Bonding
作者:Natsuki Kato、Takeshi Nanjo、Yoshiji Takemoto
DOI:10.1021/acscatal.2c02067
日期:2022.7.1
direct, photocatalytic reductive cleavage of the C–Br bond. A wide variety of alkyl bromides including unactivated ones can be used under ambient conditions without any additional activating agents to give the C–C coupling products in good yield. Mechanistic studies indicated that the photocatalyst interacts with alkyl bromides throughhalogenbonding and that the pyridine moiety is important for the progress