Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Katsumasa Sakamoto"'
Autor:
Takehiko Kitamori, Mitsuo Kitaoka, Yutaka Takahashi, Yoshikazu Yoshida, Ryo Sakai, Katsumasa Sakamoto
Publikováno v:
Journal of the Mass Spectrometry Society of Japan. 54:19-24
In this study, the on-line high-throughput detection technique of a reaction product of a micro-chemical synthesis using microchips was developed by means of an electrospray ionization mass spectrometry (ESIMS) with on-chip purification (extraction)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a640d8be497062a4afec0f009686ab63
https://doi.org/10.5702/massspec.54.19
https://doi.org/10.5702/massspec.54.19
Publikováno v:
Journal of Organometallic Chemistry. 624:287-293
A variety of organotin triflate clusters are obtained by treating dialkyltin oxide with triflic acid (TfOH) in different ratios. When R2SnO is exposed to 0.5 equivalents of TfOH, 3-hydroxy-1-triflato distannoxanes (1) are formed which have a novel sh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac7064cc743f9e6667dc5eec4e2e2318
https://doi.org/10.1016/s0022-328x(00)00939-6
https://doi.org/10.1016/s0022-328x(00)00939-6
Autor:
Junzo Otera, Fukuyama Takahide, Katsumasa Sakamoto, Andrew Duthie, Marcus Schulte, Akihiro Orita, Dainis Dakternieks, Sandrine Durand, Klaus Jurkschat
Publikováno v:
Organometallics. 19:3220-3223
The effectiveness of cationic species for increasing the catalytic activity of organotin Lewis acids has been assessed by comparing two types of cationic organotin clusters, [Bu2Sn(OH)(H2O)]22+2OTf- and [(BuSn)12O14(OH)6]2+Cl-2·2H2O, with neutral cl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d0c6acc5dd5e2fccd261b1a4935dfb18
https://doi.org/10.1021/om990973b
https://doi.org/10.1021/om990973b
Publikováno v:
Synlett. 2000:140-1042
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::198472a37461dade2e313a2b00f7c94d
https://doi.org/10.1055/s-2000-6474
https://doi.org/10.1055/s-2000-6474
Publikováno v:
Tetrahedron. 55:2899-2910
Distannoxane catalysts effect acylation of alcohols by action of esters and acetic anhydride. In particular, use of enol esters provides an extremely useful method. Primary alcohols are acylated in preference to secondary ones as well as phenol. Both
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42253dee90ed4ec61dc32fd91c20a0cb
https://doi.org/10.1016/s0040-4020(99)00072-1
https://doi.org/10.1016/s0040-4020(99)00072-1
Publikováno v:
Journal of Organometallic Chemistry. 574:58-65
A variety of pentafluorophenyltin compounds were prepared and their chemical properties were examined. These compounds effectively catalyzed Mukaiyama-aldol reaction of ketene silyl acetal in sharp contrast to the inertness of normal alkyltin halides
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d2d9431015a7ab9e723d2ed6eae5ea9
https://doi.org/10.1016/s0022-328x(98)00928-0
https://doi.org/10.1016/s0022-328x(98)00928-0
Publikováno v:
The Journal of Organic Chemistry. 63:9739-9745
Ketene silyl acetals undergo facile reaction with ketones in the presence of a Lewis acid such as (C6F5)2SnBr2, TMSOTf, or Sc(OTf)3. This unique reactivity allows ketones to react in preference to aldehydes or acetals in competitive aldol-type reacti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15b10f869ab1e500a403a9443be3369f
https://doi.org/10.1021/jo981218v
https://doi.org/10.1021/jo981218v
Publikováno v:
Tetrahedron. 54:8411-8420
“Parallel recognition”, a new concept for compacting synthetic processes in which different transformations are performed simultaneously on separate reaction sites, has been advanced. Ketones/α,β-enones and aldehydes/acetals are able to react s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5c9cd040cc59d8749594c01c698de369
https://doi.org/10.1016/s0040-4020(98)00462-1
https://doi.org/10.1016/s0040-4020(98)00462-1
Publikováno v:
Tetrahedron Letters. 39:3201-3204
Asymmetric desymmetrization in chiral organotin-catalyzed reaction of 2-substituted 1,3-propanediol with phenyl isocyanate exhibits a linear variation of %ee depending on the reaction temperature and, thus, the chirality sense is inverted from one en
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5849e6c190ac8c54078279a1f5441266
https://doi.org/10.1016/s0040-4039(98)00459-6
https://doi.org/10.1016/s0040-4039(98)00459-6
Autor:
Junzo Nokami, Kenji Yoshizane, Masahiro Maeda, Katsumasa Sakamoto, Kazushi Kouge, Nobuyuki Imai
Publikováno v:
Tetrahedron Letters. 38:1423-1426
A new disulfonamide prepared from α-amino acid in five steps catalyzed cyclopropanation of allylic alcohols with Et 2 Zn and CH 2 I 2 to afford the corresponding cyclopropylmethanols in moderate to good enantioselectivites. In particular, the reacti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8add8fba70ac04823169a0ee8f68bd7b
https://doi.org/10.1016/s0040-4039(97)00038-5
https://doi.org/10.1016/s0040-4039(97)00038-5