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2005
Pyrazine derivatives
R 0550
Influence of N(2)-Substitution in the Alkylation of (4S)-Alkyl-2,4-dihy— The alkylation of dilithiated spe10- 159 dro-1H-pyrazino[2,1-b]quinazoline-3,6-diones.
cies derived from N(2)-unsubstituted title compounds as well as from N(2)-phenyl and
N(2)-(1-phenylethyl) analogues is studied. In substrates (I) and (V), the trans-diastereoselectivity of the 1-alkylation is controlled by 1,4-asymmetric induction (to be continued). — (HERNANDEZ, F.; MORALES, V.; BUENADICHA, F. L.;
SOELLHUBER*, M.; AVENDANO, C.; Tetrahedron: Asymmetry 15 (2004) 19,
3045-pp; Dep. Quim. Org., Fac. Farm., Univ. Complutense, E-28040 Madrid, Spain;
Eng.) — Klein
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