Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Hiroshi Akutsu"'
Autor:
Daiki Ishii, Shin‐ichi Hirashima, Kosuke Nakashima, Yasuyuki Matsushima, Takaaki Sakai, Hiroshi Akutsu, Tsuyoshi Miura
Publikováno v:
Asian Journal of Organic Chemistry. 12
Autor:
Kosuke Nakashima, Hiroshi Akutsu, Tsuyoshi Miura, Shin-ichi Hirashima, Takashi Matsumoto, Ryo Tsuyusaki, Hikaru Yanai, Masahiro Kawada
Publikováno v:
Chemistry, an Asian journal. 16(16)
An improved diaminomethylenemalononitrile organocatalyst, bearing a N,N-disubstituted structure, promoted enantioselective conjugate addition reaction of α-branched aldehydes with vinyl sulfone, affording adducts with excellent enantioselectivities
Autor:
Hiroshi Akutsu, Hikari Matsumoto, Shin-ichi Hirashima, Tsuyoshi Miura, Yuji Koseki, Kosuke Nakashima
Publikováno v:
Tetrahedron. 75:2431-2435
The asymmetric direct bisvinylogous conjugate addition of 5-benzylfurfural derivatives to nitroalkenes using a thiourea organocatalyst resulted in a corresponding e-regioselective addition products in high yields and up to 95% enantiomeric excess.
Autor:
Kosuke Nakashima, Yasuyuki Matsushima, Tsuyoshi Miura, Shin-ichi Hirashima, Takaaki Sakai, Daiki Ishii, Masahiro Kawada, Hiroshi Akutsu
Publikováno v:
Organic letters. 23(2)
A diaminomethylenemalononitrile organocatalyst efficiently promotes the asymmetric direct vinylogous conjugate additions of α-angelica lactones to benzoyl acrylonitrile derivatives, resulting in the corresponding addition products bearing vicinal te
Autor:
Tatsuki Nakano, Shin-ichi Hirashima, Tsuyoshi Miura, Kosuke Nakashima, Hiroshi Akutsu, Masahiro Kawada, Ryoga Arai
Publikováno v:
The Journal of organic chemistry. 85(5)
Asymmetric conjugate additions of phosphonates to trans-crotonophenone and chalcone derivatives using a diaminomethylenemalononitrile organocatalyst resulted in the generation of the corresponding chiral γ-ketophosphonates in high yields with excell
Autor:
Kosuke Nakashima, Moeko Kitahara, Yuji Koseki, Shin-ichi Hirashima, Hiroshi Akutsu, Tsuyoshi Miura
Publikováno v:
Tetrahedron Letters. 58:4759-4762
A pyrrolidine–diaminomethylenemalononitrile organocatalyst efficiently promotes the asymmetric direct bisvinylogous Michael addition of 5-benzylfurfural derivatives to nitroalkenes, affording the corresponding e-regioselective addition products in
Autor:
Hiroshi Akutsu, Takashi Matsumoto, Hideki Hakamata, Kosuke Nakashima, Ryuta Takahashi, Yuji Koseki, Akira Kotani, Hikaru Yanai, Tomoyuki Yamamoto, Shin-ichi Hirashima, Akihiro Yoshida, Tsuyoshi Miura
Publikováno v:
Synlett. 28:1363-1367
Asymmetric catalytic activities of various organocatalysts bearing double hydrogen-bonding donor units showing different pK a values were examined for direct aldol reactions of cyclohexanone with aromatic aldehydes. Organocatalyst with motif exhibiti
Autor:
Toru Izui, Sachiko Nakagawa, Hiroshi Akutsu, Masahiko Narita, Nobuto Matsuhira, Yosuke Tsuchiya, Motohiro Yasuda
Publikováno v:
Journal of the Robotics Society of Japan. 35:403-413
Autor:
Mifuyu Ito, Shin-ichi Hirashima, Hiroshi Akutsu, Masahiro Kawada, Kosuke Nakashima, Tsuyoshi Miura
Publikováno v:
Tetrahedron Letters. 61:151478
Asymmetric e-alkylation reaction of substituted 5-benzylfurfural derivatives to nitroalkenes by controlling the stereochemistry of the trienamine intermediate resulted in corresponding e-regioselective addition products in high yields, diastereoselec
Autor:
Yuji Koseki, Akichika Itoh, Hiroshi Akutsu, Tsuyoshi Miura, Kosuke Nakashima, Norihiro Tada, Shin-ichi Hirashima
Publikováno v:
Tetrahedron Letters. 56:558-561
Pyrrolidine–diaminomethylenemalononitrile (pyrrolidine–DMM) organocatalyst has been an efficient reaction medium to promote asymmetric direct aldol reactions to afford the corresponding addition products in high yields with up to 99% ee under sol