OPP
OPP
H
+
H 2 O
OPP
OH
8
Fig. 56 One example of the
6/6-membered ring
formation
81
COOMe
OH
O
O
COOH
OH
O
O
OH
82
Fig. 57 Structures of
salvimirzacolide (81) and
salvileucolide methyl ester
(82)
83
O
OSO 3 Na
Fig. 58 Structure of
halisulfate-3 (83)
OPP
OPP
H
+
H
OPP
8
H
Fig. 59 Proposed
cyclization mechanism to
generate the basic carbon
skeleton of 83
32
T. Mitsuhashi and I. Abe
OPP
H
+
H 2 O
OPP
OH
8
Fig. 56 One example of the
6/6-membered ring
formation
81
COOMe
OH
O
O
COOH
OH
O
O
OH
82
Fig. 57 Structures of
salvimirzacolide (81) and
salvileucolide methyl ester
(82)
83
O
OSO 3 Na
Fig. 58 Structure of
halisulfate-3 (83)
OPP
OPP
H
+
H
OPP
8
H
Fig. 59 Proposed
cyclization mechanism to
generate the basic carbon
skeleton of 83
32
T. Mitsuhashi and I. Abe