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2442443990
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note
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3), respectively.
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31
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85047699456
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(b) Having used up to 3 equiv of s-BuLi and in consideration of the fact that unactivated epoxides can also undergo direct deprotonation (s-BuLi/TMEDA) to give destabilized oxiranyllithiums (Hodson, D. M.; Gras, E. Angew Chem., Int. Ed. 2002, 41, 2376-2378), we also checked enantiomeric purity of an the chiral nonracemic substituted phenylpropylene oxides synthesized, even if the dr would have been sufficient to ascertain the configurational stability of their lithiated precursors.
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(e) An NMR-spectroscopic study on lithiated phenylpropylene oxides is under way and will be reported in due course.
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40
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0030665236
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The preparation of only a mixture of the optically active trans- and cis-epoxides 3b/3f has been reported till now: Wang, Z.-X.; Tu, Y.; Frohn, M.; Zhang, J.-R.; Shi, Y. J. Am. Chem. Soc. 1997, 119, 11224-11235.
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2442479442
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note
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The convention employed for describing syn and anti diastereomers is as follows: if the main chain is written in an extended (zigzag) conformation, the diastereomer that has the oxiranyl ring and the hydroxy group both projecting either forward (bold bonds) or away from the viewer (dashed bonds) is called syn.
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44
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2442601232
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CCDC-232045 contains the supplementary crystallographic data for compound (±)-3j. These data can be obtained free of charge at www.ccdc.ac.uk/conts/retrieving.html or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK.; Fax: (int) +44-1223/336-033; E-mail: deposit@ccdc.cam.ac.uk.
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2442552784
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note
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α-C=O bond. To introduce electron correlation in the computation of the energetics, the two local minimum-energy conformers found (corresponding just to those represented in Scheme 4 with the phenyl ring perpendicular to the C=O moiety) were subjected to single-point calculations using the density functional theory (DFT) at the B3LY/6-31 + G*/PM3 level of theory: the conformer having the oxiranyl oxygen anti to the C=O group, predicted to be the more reactive one, also resulted to be the more stable one of about 3.7 kca1/mol.
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