摘要:
Acetalisation of p-anisaldehyde by either (R) or (S)-butanetriol has been shown to occur selectively and quantitatively by using Noyori's protocol. The crystalline dioxane derivatives R-6a and S-ba which formed respectively, in these conditions have been convened efficiently into the title fragments of spiramycin. (C) 1997 Elsevier Science Ltd.