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• W2036074920 abstract "A simple dipeptide, (R)-(1-naphthyl)glycyl-(R)-phenylglycine [(R,R)-1], formed inclusion compounds with several α-hydroxy esters (2) with high enantioselectivity. By crystallization of a mixture of the dipeptide [(R,R)-1] and racemic 2a [MeCH(OH)COOMe] from methanol, asymmetric recognition occurred to give an inclusion compound that contains the S form of 2a in 89% ee. X-ray crystallographic study of the inclusion compound elucidated that the dipeptide molecules arrange in a “folded antiparallel” β-sheetlike structure to accommodate the α-hydroxy ester in the pocket-type cavity surrounded by naphthyl and phenyl groups on the sheet. Similarly, 2b [MeCH(OH)COOEt] and 2f [dihydro-3-hydroxy-4,4-dimethyl-2(3H)-furanone] were included with high enantioselectivity of the S form. When bulkier 2l [t-BuCH(OH)COOMe] was used as a guest molecule, the arrangement of dipeptide molecules changed to an “extended antiparallel” mode, where the naphthyl and phenyl groups arranged in a “parallel stacked and displaced” mode and a channel-type cavity was constructed. The guest molecules were accommodated via hydrogen bonding in the channel-type cavity with high enantioselectivity of the S form (82% ee). In the case of 2k [i-PrCH(OH)COOMe], optically pure (S)-2k formed the dipeptide sheet with the “folded antiparallel” structure by cocrystallization with (R,R)-1, while the “extended antiparallel” structure appeared in the inclusion of racemic 2k." @default.
• W2036074920 created "2016-06-24" @default.
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• W2036074920 date "1999-03-11" @default.
• W2036074920 modified "2023-09-24" @default.
• W2036074920 title "Enantiomeric Inclusion of α-Hydroxy Esters by (<i>R</i>)-(1-Naphthyl)glycyl-(<i>R</i>)-phenylglycine and the Crystal Structures of the Inclusion Cavities" @default.
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• W2036074920 doi "https://doi.org/10.1021/jo9818778" @default.
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