P. Breuilles et al., TOWARD A TOTAL SYNTHESIS OF AN AGLYCONE OF SPIRAMYCIN - A CHIRON APPROACH TO THE C-1 C-4 AND THE C-13/C-15 FRAGMENTS/, Tetrahedron letters, 38(37), 1997, pp. 6607-6610
Acetalisation of p-anisaldehyde by either (R) or (S)-butanetriol has b
een shown to occur selectively and quantitatively by using Noyori's pr
otocol. 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.