os0nr¹s v t b e¹lÕ - jst · med. chem. lett., 17, 3095(2007) target molecule o oh oh oh o o oh...

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81% (2 steps)

Ns = S

O

O

O2N

H

H

H

H H

H

H+

R

O

OH

O

O

OHR

H+

H Oxidation

+H2O

H+

R

R

H

CO2

OTBDPS

OBnOBn

OBn

OTBDPS

OBnOBn

OBn

OBn

OBn

OBn

OBn

OBn

OBn

OBn

OBn

OBn

O

O

HO

OH

OH

A C

B

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