- Reversible diastereoselective photocyclization of phenylglyoxylamides of α-amino acid methyl esters to 3-hydroxy β-lactams
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Phenylglyoxylamides 1a-m were prepared from enantiomerically pure (1b-l) α-amino acid methyl esters in high yields and irradiated in acetonitrile solutions with λ = 300 nm to give the β-lactams 2a-m as photocyclization products in moderate (38 and 40perce
- Griesbeck,Heckroth
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p. 131 - 133
(2007/10/03)
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- Preparation of optically active peralkyldiphosphines and their use, as the rhodium(I) complex, in the asymmetric catalytic hydrogenation of ketones
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Two types of the optically active peralkyldiphosphine, 2,3-O-isopropylidene-2,3-dihydroxy-1,4-bis(dialkylphosphino)butane (Rdiop 3) and N-(N'-substituted carbamoyl)-4-dicyclohexylphosphino-2-dicyclohexylphosphinomethylpyrrolidine (R-Cycapp 8), have been p
- Tani, Kazuhide,Suwa, Kenichi,Tanigawa, Eiji,Ise, Tomokazu,Yamagata, Tsuneaki,et al.
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p. 203 - 222
(2007/10/02)
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- SYNTHESIS OF CHIRAL OLIGOPEPTIDES BY MEANS OF CATALYTIC ASYMMETRIC HYDROGENATION OF DEHYDROPEPTIDES
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Asymmetric hydrogenation of Ac-ΔTyr(Ac)-(S)-Ala-Gly-OMe (6), Ac-ΔTyr(Ac)-(R)-Ala-Gly-(S)-Phe-OMe (7), Ac-ΔPhe-NH-CH(R)-CH2-OCH2Ph (10), HCO-ΔPhe-(S)-Leu-OMe (16), X-AA-ΔPhe-AA'-OMe ( 5: X=tBOC, CBZ, CF3CO; AA, AA'= α-amino acid ), and t
- Ojima, Iwao,Yoda, Noriko,Yatabe, Momoko,Tanaka, Toshiyuki,Kogure, Tetsuo
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p. 1255 - 1268
(2007/10/02)
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- SYNTHESIS OF CHIRAL DEPSIPEPTIDE BUILDING BLOCK BY THE ASYMMETRIC REDUCTION OF N-(α-KETOACYL)-α-AMINO ESTERS
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Asymmetric reduction of N-(α-ketoacyl)-α-amino esters was performed by using homogeneous hydrosilylation and hydrogenation catalyzed by rhodium(I) complexes.The asymmetric hydrosilylation achieved good to high stereoselectivities giving the corresponding
- Ojima, Iwao,Tanaka, Toshiyuki,Kogure, Tetsuo
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p. 823 - 826
(2007/10/02)
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