Toshikatsu Takanami

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Organization: Meiji Pharmaceutical University
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Co-reporter:Satoshi Hayashi, Miku Yotsukura, Masahiro Noji and Toshikatsu Takanami  
Chemical Communications 2015 vol. 51(Issue 55) pp:11068-11071
Publication Date(Web):28 May 2015
DOI:10.1039/C5CC03303A
A facile and direct protocol to determine the absolute configurations of chiral mono-alcohols without analyte derivatization can now be realized using a novel circular dichroic (CD)-sensitive bis(zinc porphyrin) BP1 host system. The binding of mono-alcohols to BP1 should be greatly enhanced by the simultaneous double coordination of the hydroxyl group to the two central metals of the porphyrin subunits.
Co-reporter:Noriaki Sugita, Satoshi Hayashi, Fumio Hino, and Toshikatsu Takanami
The Journal of Organic Chemistry 2012 Volume 77(Issue 23) pp:10488-10497
Publication Date(Web):November 20, 2012
DOI:10.1021/jo302122f
We have developed an efficient method for preparing silylmethyl-substituted porphyrins via the palladium-catalyzed Kumada cross-coupling reaction of bromoporphyrins with silylmethyl Grignard reagents. We demonstrated the synthetic utility of these silylmethylporphyrins as a multipurpose synthon for fabricating porphyrin derivatives through a variety of transformations of the silylmethyl groups, including the DDQ-promoted oxidative conversion to CHO, CH2OH, CH2OMe, and CH2F functionalities and the fluoride ion-mediated desilylative introduction of carbon–carbon single and double bonds.
Co-reporter:Toshikatsu Takanami, Satoshi Hayashi, Kazuhiro Iso, Jun Matsumoto, Fumio Hino
Tetrahedron Letters 2011 Volume 52(Issue 41) pp:5345-5348
Publication Date(Web):12 October 2011
DOI:10.1016/j.tetlet.2011.08.025
An efficient one-pot protocol for the direct conversion of free base 5,15-disubstituted porphyrins into the corresponding meso activated alkenyl-substituted meso-formylporphyrins has been developed using a sequential SNAr reaction with PyMe2SiCH2Li, conjugate addition to enones or alkenoates in the presence of TMSCl, and oxidation with DDQ.
Co-reporter:Kohji Suda, Shin-ichiro Nakajima, Yasumi Satoh and Toshikatsu Takanami  
Chemical Communications 2009 (Issue 10) pp:1255-1257
Publication Date(Web):20 Jan 2009
DOI:10.1039/B820948K
The metallophthalocyanine complex Cr(TBPC)OTf works as a highly efficient, recyclable Lewis acid catalyst for the regio- and stereoselective rearrangements of epoxides to aldehydes.
Co-reporter:Toshikatsu Takanami, Atsushi Wakita, Jun Matsumoto, Sadashige Sekine and Kohji Suda  
Chemical Communications 2009 (Issue 1) pp:101-103
Publication Date(Web):19 Nov 2008
DOI:10.1039/B817551A
An efficient one-pot procedure which converts 5,15-disubstituted porphyrins into their corresponding mesoacyl-, alkoxycarbonyl-, and carbamoyl-substituted meso-formylporphyrins has been developed, where the procedure involves a sequential SNAr reaction of porphyrins with PyMe2SiCH2Li, followed by acylation or related reactions and oxidation.
Co-reporter:Toshikatsu Takanami, Jun Matsumoto, Yoko Kumagai, Aoyo Sawaizumi, Kohji Suda
Tetrahedron Letters 2009 50(1) pp: 68-70
Publication Date(Web):
DOI:10.1016/j.tetlet.2008.10.087
Co-reporter:Noriaki Sugita, Satoshi Hayashi, Masashi Shibata, Taiga Endo, Masahiro Noji, Kazuhiko Takatori and Toshikatsu Takanami
Organic & Biomolecular Chemistry 2016 - vol. 14(Issue 43) pp:NaN10192-10192
Publication Date(Web):2016/10/21
DOI:10.1039/C6OB02243J
An efficient approach to meso-unsubstituted β-silylporphyrins was developed through highly regioselective Ir-catalyzed C–H activation, in the presence of HSiMe(OSiMe3)2 as the Si source, from meso-unsubstituted porphyrins. Further transformations of the silyl group, such as oxidation, halogenation, and cross-coupling reactions, could be achieved under mild conditions, demonstrating the synthetic utility of β-silylporphyrins as a multipurpose synthon for fabricating porphyrin derivatives.
Co-reporter:Satoshi Hayashi, Miku Yotsukura, Masahiro Noji and Toshikatsu Takanami
Chemical Communications 2015 - vol. 51(Issue 55) pp:NaN11071-11071
Publication Date(Web):2015/05/28
DOI:10.1039/C5CC03303A
A facile and direct protocol to determine the absolute configurations of chiral mono-alcohols without analyte derivatization can now be realized using a novel circular dichroic (CD)-sensitive bis(zinc porphyrin) BP1 host system. The binding of mono-alcohols to BP1 should be greatly enhanced by the simultaneous double coordination of the hydroxyl group to the two central metals of the porphyrin subunits.
Co-reporter:Kohji Suda, Shin-ichiro Nakajima, Yasumi Satoh and Toshikatsu Takanami
Chemical Communications 2009(Issue 10) pp:NaN1257-1257
Publication Date(Web):2009/01/20
DOI:10.1039/B820948K
The metallophthalocyanine complex Cr(TBPC)OTf works as a highly efficient, recyclable Lewis acid catalyst for the regio- and stereoselective rearrangements of epoxides to aldehydes.
Co-reporter:Toshikatsu Takanami, Atsushi Wakita, Jun Matsumoto, Sadashige Sekine and Kohji Suda
Chemical Communications 2009(Issue 1) pp:NaN103-103
Publication Date(Web):2008/11/19
DOI:10.1039/B817551A
An efficient one-pot procedure which converts 5,15-disubstituted porphyrins into their corresponding mesoacyl-, alkoxycarbonyl-, and carbamoyl-substituted meso-formylporphyrins has been developed, where the procedure involves a sequential SNAr reaction of porphyrins with PyMe2SiCH2Li, followed by acylation or related reactions and oxidation.
21H,23H-Porphine, 10-bromo-5,15-bis(4-methylphenyl)-
2-Heptanol,1,1,1-trifluoro-, (2R)-
1,2:5,6-DI-O-CYCLOHEXYLIDENE-3-CYANO-ALPHA-D-ALLOFURANOSE
(S)-2-Hydroxypent-4-ene
R-3-Butyn-2-ol