The reaction of taxol (I) with benzyloxycarbonyl chloride and DIEA in dichloromethane gives the protected compound (II), which is treated with DAST in the same solvent to yield the cyclopropa taxol (III). The hydrogenolysis of (III) with H2 over Pd/C affords compound (IV), which is deacylated with tetrabutylammonium borohydride in dichloromethane to provide the cyclopropa baccatin (V). The acylation of (V) with azetidinone (VI) by means of BuLi in THF gives the silylated taxoid (VII), which is finally desilylated with HCl in acetonitrile to afford the target compound.

The reaction of the taxane derivative (I) with trifluoromethanesulfonic anhydride gives the monotriflate (II), which is treated with sodium azide in hot acetonitrile to yield the cyclopropa derivative (III). The cleavage of the oxazolidine ring of (III) by means of formic acid affords the 3-amino-2-hydroxy derivative (IV), which is finally acylated with tert-butoxycarbonyl anhydride to provide the target taxoid derivative.

The reaction of the taxane derivative (I) with trifluoromethanesulfonic anhydride gives the monotriflate (II), which is treated with sodium azide in hot acetonitrile to yield the cyclopropa derivative (III). The cleavage of the oxazolidine ring of (III) by means of formic acid affords the 3-amino-2-hydroxy derivative (IV), which is finally acylated with tert-butoxycarbonyl anhydride to provide the target taxoid derivative.

The reaction of the taxoid compound (I) with DAST gives the cyclopropataxoid compound (II), which is finally deprotected with Zn and HOAc to yield the target compound.