Toward a total synthesis of an aglycone of spiramycine; two complementary accesses to a C-5C-9 fragment
摘要:
Both homochiral acetates 4d and 5f, which were obtained by lipase-catalysed acetylation of either the tetraol 4a or the diol 5e, respectively have been convened stereoconvergently into a C-5/C-9 fragment of the title antibiotic. (C) 1997 Published by Elsevier Science Ltd.
Treatment by sulfuryl chloride of the bis-O-TES derivative of a gamma,epsilon-bis-hydroxy phenylsulfoxide resulted in the selective formation of the corresponding gamma-chloro-epsilon-hydroxy phenylsulfone. (C) 1997 Published by Elsevier Science Ltd.