route to β-enamino esters 1, using accessible starting materials, was developed. Lithiated enamines are allowed to react with diethyl carbonate or benzyl chloroformate with the formation of the β-enamino esters 1a or 1b. The reaction is rather general from a wide array of ketimines and aldimines. Products included cyclic β-enamino esters 1aa-ac, very useful for the synthesis of natural products.
Absolute configuration at chiral nitrogen in oxaziridines. 2
作者:Danuta Mostowicz、Czeslaw Belzecki
DOI:10.1021/jo00444a027
日期:1977.11
Two new chiral equivalents of H2S: a thio- and a dithiocarboxylic acid
作者:Pedro de March、Marta Figueredo、Josep Font、Lluïsa González、Antonio Salgado
DOI:10.1016/0957-4166(96)00334-5
日期:1996.9
The syntheses of the two new chiral mercapto derivatives (R)-2-[N-(1-phenylethyl)amino]-1-cyclopentenedithiocarboxylic acid, 5, and (1S,4R)-1-(4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane) thiocarboxylic acid, 9, are described through easy transformations in good yields. Copyright (C) 1996 Elsevier Science Ltd