Regio- and stereoselective synthesis of the enantiomers of monoterpene-based β-amino acid derivatives
作者:Zsolt Szakonyi、Tamás A. Martinek、Reijo Sillanpää、Ferenc Fülöp
DOI:10.1016/j.tetasy.2007.09.028
日期:2007.10
The regio- and stereospecific addition of chlorosulfonyl isocyanate to cis-delta-pinene enantiomers has furnished monoterpene-fused beta-lactams. The observed regioselectivity can be explained by ab initio DFT modeling of transition state structures. In contrast with the less reactive alpha-pinane-fused beta-lactam 4, the resulting beta-lactams 5 and 13 containing an amino group connected to a secondary carbon possess similar reactivity to the cycloalkane-fused analogues and can be easily converted to the beta-amino acid and its protected derivatives. The base-catalyzed isomerization of the cis-amino ester afforded the corresponding trans-amino ester in moderate yield. (c) 2007 Published by Elsevier Ltd.
Giddings, Rodney M.; Jones-Parry, Richard; Salmon, J. Roger, Journal of the Chemical Society. Perkin transactions II, 1982, p. 725 - 728
作者:Giddings, Rodney M.、Jones-Parry, Richard、Salmon, J. Roger、Whittaker, David