Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Obora A"'
Autor:
Tatsuki Nagata, Yasushi Obora, Xianjin Lin, Yasuharu Kanda, Ken-ichi Shimizu, Ryota Kondo, Takeyuki Suzuki, Tatsuya Tanaka, Takashi Toyao
Publikováno v:
ChemCatChem. 14
Publikováno v:
The Journal of organic chemistry. 85(18)
The development of a C2-extension of primary alcohols with ethanol as the C2 source and catalysis by [Cp*IrCl2]2 (where Cp* = pentamethylcyclopentadiene) is described. This new extension system was used for a range of benzylic alcohol substrates and
Autor:
Jungo Kimura, Ken-ichi Shimizu, Yasushi Obora, Hideya Kawasaki, Hiroki Yano, Kazuo Kato, Ryusei Azuma, Ryota Kondo, Yasuharu Kanda, Takeyuki Suzuki, Seiya Nakamichi
Publikováno v:
ChemCatChem. 10:2378-2382
Autor:
Maito Fuji, Yasushi Obora
Publikováno v:
Organic Letters. 19:5569-5572
NbCl5-catalyzed [2 + 2 + 2] cycloaddition of nitriles with alkynes was used to synthesize pyrimidine derivatives. In this reaction, the use of individual Lewis acids, namely NbCl5 and FeCl3, is a key strategy for achieving the reaction using a cataly
Autor:
Yasushi Obora, Yasushi Satoh
Publikováno v:
European Journal of Organic Chemistry. 2015:5041-5054
Niobium complexes in organic reactions have received a lot of attention in recent years. Niobium is one of the early transition metals, which possess unique reactivity distinct from that of other transition metals. This review focuses mainly on stoic
Autor:
Yasushi Obora
Publikováno v:
ACS Catalysis. 4:3972-3981
This paper summarizes recent advances in α-alkylation reactions based on hydrogen borrowing methodologies using alcohol as an alkylating agent. This review provides a summary of recent progress toward the α-alkylation of carbonyl substrates, as wel
Publikováno v:
Chemistry Letters. 45:943-945
NbCl5 serves as an efficient catalyst for the intermolecular [2+2+2] cycloaddition of alkynes and alkenes to afford 1,3-cyclohexadienes. A convenient system has been developed using excess alkene, which enables the reaction to proceed without using l
Autor:
Yasushi Satoh, Yasushi Obora
Publikováno v:
Journal of Synthetic Organic Chemistry, Japan. 72:257-267
Publikováno v:
Journal of Organometallic Chemistry. :109-113
A new highly active low-valent alkoxyniobium species has been developed following the reaction of Nb(OEt)5 with Grignard reagent such as i-PrMgCl or EtMgCl, with the material behaving as an efficient catalyst for cyclotrimerization reaction of isocya
Publikováno v:
The Journal of Organic Chemistry. 77:9429-9433
Iridium-catalyzed alkylation of methylquinolines at the methyl substituent was achieved using alcohols as alkylating agents. The reaction proceeded through a transfer hydrogenation pathway from the alcohol to the Ir complex, affording an aldehyde and