合成路线1

The reaction of the OH group of (LII) with trichloroacetyl isocyanate and K2CO3 in methanol gives the carbamate (LIII). The reduction of the ester group of (LIII) with DIBAL in dichloromethane yields the primary alcohol (LIV), which is oxidized with DMP to afford the aldehyde (LV). The condensation of (LV) with the boron enolate (LVI), (obtained by reaction of the 5-oxohexanoic ester intermediate (XI) with (c-Hex)2B-Cl), provides the chiral 5-oxotetracosatetraenoic ester (LVII), which is reduced with Me4HBH(OAc)3 in acetonitrile/AcOH to give the dihydroxyester (LVIII). Finally, this compound is lactonized and simultaneously deprotected by means of HF/pyridine in THF or HCl in methanol giving rise to the target (+)-Discodermolide.