Chemistry Reference
In-Depth Information
OBn
OBn
O
O
BnO
BnO
OBn
OBn
BnO
BnO
BnO
BnO
O
O
SEt
(+ β)
O
O
BnO
BnO
NIS, cat. Cu(OTf)
2
BnO
BnO
61
O
+
OBn
63
HO
OBn
O
N
3
62
OBn
BnO
BnO
O
O
BnO
OBn
OBn
BnO
O
110°C
O
O
OBn
BnO
BnO
OBn
BnO
BnO
BnO
OBn
O
64
O
O
BnO
BnO
BnO
BnO
OBn
OBn
BnO
O
O
O
N
BnO
O
N
N
BnO
OBn
BnO
+
O
BnO
BnO
O
O
BnO
OBn
N
BnO
O
N
O
N
O
65
OBn
OBn
HO
BnO
BnO
O
BnO
O
OBn
BnO
BnO
O
O
OBn
BnO
66
BnO
SCHEME 5.17
Synthesis of oligosaccharide analogs obtained by thermal cycloaddition.
HO
OH
OH
HO
HO
2
C
HO
HO
2
C
O
O
O
O
N
O
N
N
OH
O
HO
O
N
HO
N
OH
N
N
N
N
OH
NHAc
NHAc
67
OAc
AcO
MeO
2
C
HO
O
O
N
OBn
O
BzO
N
N
OBz
NHAc
68
OAc
AcO
MeO
2
C
HO
O
O
OBn
N
3
+
O
BzO
NHAc
OBz
70
69
SCHEME 5.18
Retrosynthetic approach for the synthesis of GAGs analogs.
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