V. Blandin et al., NEW ONE-POT SYNTHESIS OF A CHIRAL ALPHA-HYDROXY-GAMMA-BUTYROLACTONE VIA SEQUENTIAL ASYMMETRIC HYDROGENATION OF AN ALPHA,GAMMA-DIKETOESTER, Tetrahedron : asymmetry, 9(16), 1998, pp. 2765-2768
The hydrogenation of ethyl 2,4-dioxovalerate in the presence of chiral
rhodium or ruthenium catalysts provides direct access to 2-hydroxy-4-
methyltetrahydrofuran-2-one 4 with syn:anti ratios of up to 84:16 and
with up to 98% and 94% e.e. in the syn and anti form, respectively. (C
) 1998 Elsevier Science Ltd. All rights reserved.