Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Shinji Nagumo"'
Autor:
Shunsuke Murokawa, Koki Furukawa, Yoshinori Kawano, Tsukasa Nihei, Yuji Suzuki, Eiko Yasui, Shinji Nagumo
Publikováno v:
Chemistry – An Asian Journal. 17
Publikováno v:
Tetrahedron Letters. 114:154253
Publikováno v:
Tetrahedron Letters. 60:755-759
A new cascade reaction including formal [5 + 2] cycloaddition was developed. Treatment of homocinnamyl alcohol and Co2(CO)6-complexed arylpropynal with BF3·OEt2 resulted in the generation of hydrobenzocycloheptafuran having an alkyne-Co2(CO)6 comple
Publikováno v:
Tetrahedron Letters. 96:153730
Publikováno v:
The Journal of Organic Chemistry. 83:9103-9118
A novel cascade reaction consisting of a five-membered ring selective Prins cyclization and a subsequent Friedel–Crafts cyclization is reported. Treatment of homocinnamyl alcohols and aromatic aldehydes with BF3·OEt2 in CH2Cl2 afforded hydrocyclop
Publikováno v:
Tetrahedron Letters. 71:153043
We previously have reported that an acid-promoted condensation of a hydrazonoester derived from phenylalanine afforded an azine which was converted to a pyrrole through 3 steps: isomerization to dienamine, [3,3]-sigmatropic rearrangement, and cycliza
Publikováno v:
Tetrahedron Letters. 58:3092-3095
The treatment of (2-hydroxy-5-oxobicyclo [4.1.0] hept-3-en-3-yl) carbamic acid esters and (2-hydroxy-5-oxobicyclo [4.1.0] hept-3-en-3-yl) benzamide with TMSCl gave 7-membered ring compounds in good yields. The structure of the substituent at the C3 p
Autor:
Shinji Nagumo, Masaaki Miyashita, Megumi Mizukami, Daisuke Katsumi, Naoki Terayama, Kazuki Nakasone, Eiko Yasui
Publikováno v:
The Journal of organic chemistry. 84(3)
A new efficient synthesis of sekothrixide was established on the basis of our developed regioselective coupling of epoxy sec-alcohol with Gilman reagent guided by a TMS group. The new synthetic route allowed an overall yield of 6.3% (26 steps) from o
Autor:
Megumi Mizukami, Shinji Nagumo
Publikováno v:
Journal of Synthetic Organic Chemistry, Japan. 74:18-30
Publikováno v:
Tetrahedron Letters. 55:6515-6519
Coupling reactions of epoxide linked to a secondary oxygen group with Gilman reagents were examined. The regiochemical direction depended on whether there is TMS or MOM as a protective group of the secondary alcohol. anti -Epoxy alcohol 6 tended to r