Zobrazeno 1 - 10
of 683
pro vyhledávání: '"Kunio Ogasawara"'
A diastereocontrolled synthesis of perseitol using a dioxabicyclo[3.2.1]octane chiral building block
Publikováno v:
ARKIVOC, Vol 2003, Iss 8, Pp 163-170 (2003)
Externí odkaz:
https://doaj.org/article/9b2c1ae2b98d49df90c2261765c3d845
Autor:
Shinichiro Ito, Kunio Ogasawara, Ayako Tosaka, Masatoshi Shibuya, Keisuke Hanada, Yoshiharu Iwabuchi
Publikováno v:
Tetrahedron: Asymmetry. 19:176-185
A practical route for the synthesis of both enantiomers of a functionalized bicyclo[3.2.1]octenone, which is potentially useful as a versatile chiral building block, has been developed from 1,4-cyclohexanedione monoethylene acetal by employing prolin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ecbcda750d2c195023349d7c38e582d
https://doi.org/10.1016/j.tetasy.2007.12.009
https://doi.org/10.1016/j.tetasy.2007.12.009
Autor:
Kunio Ogasawara, Norio Miyazawa
Publikováno v:
Tetrahedron Letters. 43:4773-4776
A facile enantio- and diastereocontrolled construction of 18-keto-pseudoyohimbane from a bicyclo[3.2.1]octane chiral building block has been developed employing a tandem retro-aldol and Pictet–Spengler sequence. The epimerization of the resulting p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::df5f5e632488cb02d0e0942ed1f92769
https://doi.org/10.1016/s0040-4039(02)00899-7
https://doi.org/10.1016/s0040-4039(02)00899-7
Publikováno v:
Tetrahedron Letters. 43:4175-4178
The ring-contraction of the enedione epoxide obtained from the adduct of benzoquinone and cyclopentadiene is mainly affected by the amount of base used. Excellent yields (>80%) of the ring-contracted product were consistently obtained when the epoxid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::206d999acb478705934aead879890d61
https://doi.org/10.1016/s0040-4039(02)00750-5
https://doi.org/10.1016/s0040-4039(02)00750-5
Autor:
Hideyuki Tanaka, Kunio Ogasawara
Publikováno v:
Tetrahedron Letters. 43:4417-4420
Lithium triethylborohydride has been found to be a superior and selective reagent for the removal of tertiary N-acyl protecting groups. The reagent selectively removes tertiary amide acyl functionality without affecting secondary amide functionality
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7533d37b180660511274df3cf8ef9d45
https://doi.org/10.1016/s0040-4039(02)00844-4
https://doi.org/10.1016/s0040-4039(02)00844-4
Autor:
Kunio Ogasawara
Publikováno v:
Journal of Synthetic Organic Chemistry, Japan. 60:316-329
Efficient methodology for the preparation of the artificial levoglucosenone-type chiral building blocks having a bicyclo [3. 2. 1] octane framework has been developed along with two new routes to both enantiomers of levoglucosenone. Because of their
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d8c0891c867ae6852336bf9a1ffc8a3e
https://doi.org/10.5059/yukigoseikyokaishi.60.316
https://doi.org/10.5059/yukigoseikyokaishi.60.316
Publikováno v:
Tetrahedron Letters. 43:93-96
An enantio- and diastereoselective synthesis of the methyl ester of 3,5-trans-(3R,5R)-carbapenam-3-carboxylic acid from 3-hydroxypyridine via (2R,5S)-trans-5-acetoxy-2-allylpiperidine has been achieved by employing the piperidine–pyrrolidine ring-c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1976982dd7ef9d0fae5c849e979a1168
https://doi.org/10.1016/s0040-4039(01)02073-1
https://doi.org/10.1016/s0040-4039(01)02073-1
Autor:
Norio Miyazawa, Kunio Ogasawara
Publikováno v:
Synlett. 2002:1065-1068
An enantioselective route to the key intermediate leading to (+)-vernolepin, an antitumor sesquiterpene, isolated from Vernonia hymenolepis, has been developed starting from the chiral building block having a bicyclo[3.2.1]octane framework accessible
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce6ac81d1d1898f622f15fdc1c0564cc
https://doi.org/10.1055/s-2002-32603
https://doi.org/10.1055/s-2002-32603
Autor:
Hideki Sakagami, Kunio Ogasawara
Publikováno v:
Synlett. 2001:0045-0048
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3271e552da932ea0a937cc027d19177a
https://doi.org/10.1055/s-2001-9731
https://doi.org/10.1055/s-2001-9731
Autor:
Kunio Ogasawara, Kohei Kadota
Publikováno v:
Tetrahedron Letters. 42:8661-8664
A new route to the aldopentoses, ribose and lyxose, and the aldohexoses, talose and gulose, has been developed using chiral building blocks containing a bicyclo[3.2.1]octane framework by employing a photochemical decarbonylation reaction as the key s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f64019b9b13872fdaa727ad34fd06417
https://doi.org/10.1016/s0040-4039(01)01874-3
https://doi.org/10.1016/s0040-4039(01)01874-3