394
ORGANIC SYNTHESIS—1995
VI.F-13 Taniguchi, Y. et al., TL, 35,7789; Kang, S.K. et al., TL, 35, 2357;
Hache, B. and Gareau, Y., TL, 35, 1837.
R3
Rk ^ L .R4
Yb(SR) 3
R3
R2
O
Rl
RS
R4
R2
O
11-82 %
VI.F-14 Horikawa, H. et al., TL, 35, 2187.
TBSO
Me
TBSO
Me
l;NaH
N
s
2: (PhO) 2 POCl
O
^Υ^*
3: »Pr 2 NEt, RSH
ό '
C0 2 allyl
63-66 %
C
°^
X
VLF-15 Maiti, A.K. and Bhattacharyya, P., T, 50, 10483; Oguni, N. et al.,
CC, 2699; Penso, M. et al., 5, 34; see also: Nishikubo, T. et al., TL, 35,
4571.
R^^OH
R^ JOH
J
TolS0 2
70-90 %
TolS0 2 Na
\
T
'ph-H,H 2 0 K o PhS H> CH 2 Cl 2>
J
mtn-uL
^
PEG 4000, rt
H S ^
PEG 4000
Δ
HS
60-80 %
ORGANIC SYNTHESIS—1995
VI.F-13 Taniguchi, Y. et al., TL, 35,7789; Kang, S.K. et al., TL, 35, 2357;
Hache, B. and Gareau, Y., TL, 35, 1837.
R3
Rk ^ L .R4
Yb(SR) 3
R3
R2
O
Rl
RS
R4
R2
O
11-82 %
VI.F-14 Horikawa, H. et al., TL, 35, 2187.
TBSO
Me
TBSO
Me
l;NaH
N
s
2: (PhO) 2 POCl
O
^Υ^*
3: »Pr 2 NEt, RSH
ό '
C0 2 allyl
63-66 %
C
°^
X
VLF-15 Maiti, A.K. and Bhattacharyya, P., T, 50, 10483; Oguni, N. et al.,
CC, 2699; Penso, M. et al., 5, 34; see also: Nishikubo, T. et al., TL, 35,
4571.
R^^OH
R^ JOH
J
TolS0 2
70-90 %
TolS0 2 Na
\
T
'ph-H,H 2 0 K o PhS H> CH 2 Cl 2>
J
mtn-uL
^
PEG 4000, rt
H S ^
PEG 4000
Δ
HS
60-80 %