Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Katsura Seki"'
Publikováno v:
Tetrahedron Letters. 44:2167-2170
Both enantiomers of ( P )-(+)-2- and ( M )-(−)-2-acetoxy-11,14-dimethyl[5]helicenes 8 were synthesized by asymmetric aromatic oxy-Cope rearrangement of the corresponding chiral bridged bicyclic compounds, which were obtained by enzymatic resolution
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a236ead2989028e73fcfa77240a8574
https://doi.org/10.1016/s0040-4039(03)00150-3
https://doi.org/10.1016/s0040-4039(03)00150-3
Publikováno v:
Tetrahedron Letters. 43:3633-3636
An efficient one-pot synthesis of a 10,10-ethylenebicyclo[5.2.1]dec-8-en-4-one derivative, which can be considered as a synthetic intermediate for the taxane skeleton, has been achieved by tandem anionic [1,3] and oxy-Cope rearrangements of 2-vinylbi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1aa4b7b747e2238b7b91c57b4364493a
https://doi.org/10.1016/s0040-4039(02)00648-2
https://doi.org/10.1016/s0040-4039(02)00648-2
Publikováno v:
Tetrahedron Letters. 40:511-514
The anionic [1,3] rearrangement of both stereoisomeric bicyclo[3.2.1]oct-6-en-2-ols by treatment with KN(TMS) 2 in toluene or in diglyme took place as a stereoconvergent route giving each of the stereoisomeric hydroxydiquinanes.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10b1f870a63838e2effffbd738a87d5a
https://doi.org/10.1016/s0040-4039(98)02389-2
https://doi.org/10.1016/s0040-4039(98)02389-2
Publikováno v:
Tetrahedron Letters. 39:8673-8676
The aromatic oxy-Cope rearrangement including a benzene ring took place when 1-methoxy-2-aryl-bicyclo[2.2.2]oct-5-en-2- exo -ols and 2-(2-methoxyphenyl)-bicyclo[2.2.2]oct-5-en- exo -2-ols were treated with KH in THF.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c9a79a546db17e0855163f03b64e3db5
https://doi.org/10.1016/s0040-4039(98)01869-3
https://doi.org/10.1016/s0040-4039(98)01869-3
Autor:
Mari Yamada, Michinori Karikomi, Kazuo Haga, Yasushi Ogawa, Hirohiko Houjou, Kazuhisa Hiratani, Katsura Seki, Tadao Uyehara
Publikováno v:
Tetrahedron Letters. 46:5867-5869
Oxidative coupling reaction of both 3-hydroxychrysene and 2-hydroxybenzo[c]phenanthrene by using Cu(NO3)2–3H2O under atmospheric air is described. The former gave the aimed coupled biaryl derivative. However, the latter gave a further oxidized heli
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13d7d1e0777285b47857d2a893e61600
https://doi.org/10.1016/j.tetlet.2005.06.142
https://doi.org/10.1016/j.tetlet.2005.06.142
Publikováno v:
Tetrahedron Letters. 37:3059-3062
The Lewis acid mediated reactions of allenylstannanes 1 and 13 gave trans cyclic ethers 3a and 14, respectively, with high stereoselectivities. The cyclization fo 7 gave trans cyclic ether 9a. The treatment of propargylstannanes 2 and 8 with Lewis ac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4e7886ec6e5be3c0b00cb3d854c750b5
https://doi.org/10.1016/0040-4039(96)00469-8
https://doi.org/10.1016/0040-4039(96)00469-8
Publikováno v:
Phytochemistry. 40:1175-1181
Ten new (+)-hydroxybutanolides, linderanolides A-E and isolinderanolides A-E, along with one known one have been isolated from the leaves of Lindera glauca. On the basis of spectroscopic methods and chemical evidence, linderanolides A-E were shown to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b4fa498615969719b5279b62a7bbad8
https://doi.org/10.1016/0031-9422(95)00399-r
https://doi.org/10.1016/0031-9422(95)00399-r
Publikováno v:
Phytochemistry. 38:965-973
Three new compounds, along with four known ones, have been isolated from the seeds of Iris pallasii . On the basis of spectroscopic methods and chemical evidence, the new compounds were shown to be 2-[(Z)-10-heptadecenyl]-4,6-dimethoxyphenol, 3,5-dim
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7feb6bf20acfabf57c5637972da0b41f
https://doi.org/10.1016/0031-9422(94)00731-8
https://doi.org/10.1016/0031-9422(94)00731-8
Publikováno v:
Phytochemistry. 38:703-709
Four new enediones, belamcandones A-D, have been isolated from the seeds of Belamcanda chinensis . On the basis of spectroscopic methods and chemical evidence, they are concluded to be 4a,8-dihydroxy-2,7-dimethoxy-1,4-dioxo-1,4,4a,9b- tetrahydrodiben
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e7c63da47c5e4c4fead8b2f1d443144
https://doi.org/10.1016/0031-9422(94)00677-l
https://doi.org/10.1016/0031-9422(94)00677-l
Publikováno v:
Phytochemistry. 37:807-815
Eight tetracyclic spirotriterpene derivatives, iristectorones A-H, have been found in the seeds of Iris tectorum . Their structures were established to be the Diels-Alder products of 2-methoxy-6-[( Z )-10-pentadecenyl]- p -benzoquinone with triterpen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ff8f434a20d6b35d00c1294cf273fa91
https://doi.org/10.1016/s0031-9422(00)90362-5
https://doi.org/10.1016/s0031-9422(00)90362-5