Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Morio Asaoka"'
Publikováno v:
Tetrahedron. 64:1895-1900
The first enantioselective total synthesis of (+)-sarcodictyenone is described [4.3% overall yield from (5R,6R)-6-methyl-5-trimethylsily-2-cyclohexenone]. This work establishes the absolute stereochemistry of the natural product.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::847657da60f18dfaaef9b4e4b85b32c6
https://doi.org/10.1016/j.tet.2007.11.088
https://doi.org/10.1016/j.tet.2007.11.088
Publikováno v:
Natural Product Letters. 14:1-4
(+)-Bakuchiol was synthesized by using the diastereoselective alkylation of (−)-3-arylthio-5-trimethylsilylcyclohexenone as the key-step for the construction of the chiral quaternary carbon center.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0a7b0eac3c8fc0132f3b7c8d809ea89
https://doi.org/10.1080/10575639908045426
https://doi.org/10.1080/10575639908045426
Publikováno v:
Tetrahedron. 54:471-486
Diastereocontrolled reactions with 3-iodozinc-2-methylbutanamide were examined. When the iodozinc reagent was reacted with aromatic and α,β-unsaturated aldehydes in the presence of iodotrimethylsilane, C2–C3 anti-derivatives were obtained almost
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fedcf3851bd4533dbee17369a32a3387
https://doi.org/10.1016/s0040-4020(97)10292-7
https://doi.org/10.1016/s0040-4020(97)10292-7
Publikováno v:
Tetrahedron Letters. 37:7075-7078
Enantioselective synthesis of the unnatural antipode of cordiaquinone B possesing a 3-substituted 2,3,4-trimethylcyclohexanone framework was accomplished starting with (4 S , 5 S )-4-methyl-5-trimethylsilyl-2-cyclohexen-1-one. By this synthesis, the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aef1e7c7d0be2589ed20321fa07e9ff5
https://doi.org/10.1016/0040-4039(96)01556-0
https://doi.org/10.1016/0040-4039(96)01556-0
Publikováno v:
Tetrahedron Letters. 37:1045-1048
Both the syn - and anti -diastereomers of 4-aryl-2,3-dimethyl-4-oxobutanamides were respectively synthesized in a highly diastereoselective manner.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2847e85b9f961fd7ff22eee51456d669
https://doi.org/10.1016/0040-4039(95)02344-5
https://doi.org/10.1016/0040-4039(95)02344-5
Publikováno v:
Tetrahedron Letters. 36:3365-3368
The first asymmetric total synthesis of the title compounds, unnatural enantiomers, has been achieved.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b04cde357313ddbd0d4236f68f8e7e57
https://doi.org/10.1016/0040-4039(95)00542-k
https://doi.org/10.1016/0040-4039(95)00542-k
Publikováno v:
Bulletin of the Chemical Society of Japan. 67:1141-1146
Starting from optically active 5-trimethylsilyl-2-cyclohexen-1-one derivatives, the title dienes were synthesized by using silicon-mediated 1,4-elimination as a key step. A straightforward synthesis of the unnatural enantiomer of (−)-dictyopterene
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1bd0eec2125f4fd56e6a66be388bee9
https://doi.org/10.1246/bcsj.67.1141
https://doi.org/10.1246/bcsj.67.1141
Publikováno v:
Tetrahedron. 50:655-660
A formal synthesis of a marine natural product (−)-δ 9 ( 12 )-capnellene has been achieved by employing silyl group directed stereo control, starting from (−)-2-methyl-4-trimethylsilyl-2-cyclopenten-1-one.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::623bcd93586ebf9c99e2fcb246b516dc
https://doi.org/10.1016/s0040-4020(01)80784-5
https://doi.org/10.1016/s0040-4020(01)80784-5
Publikováno v:
ChemInform. 22
Ring contraction by BF3·Et2O catalyzed epoxide rearrangement of 3-substituted 5-trimethylsilyl-2,3-epoxycyclohexanones gave the corresponding 2-substituted 4-(trimethylsilyl)cyclopentanones diastereoselectively. Synthesis of (−)-massoialactone and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::06a17d74cb1004c7353559d50d407706
https://doi.org/10.1002/chin.199149121
https://doi.org/10.1002/chin.199149121
Publikováno v:
ChemInform. 22
Synthesis of the title compounds by utilizing BF 3 ·Et 2 O catalyzed ring contraction of 2,3-epoxycyclohexanones leading to 2-alkyl-2-formylcyclopentanones is described.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dda789f48ec25af6913263d439db2651
https://doi.org/10.1002/chin.199150242
https://doi.org/10.1002/chin.199150242