80
ORGANIC SYNTHESIS—1995
I.B.3-2 Mai, D. et al., JCS(Pl), 1115; see also: Hellwinkel, D. et al., S,
973; Abenhaim, D., SC, 24, 1199.
X - r
s + RCHO '
BuOLi
>
X J ^ Y " ^
R
-60°C
l < ! ! ! ^ C O î H
40-54%
I.B.3-3 Ballini, R. and Rinaldi, A., TL, 35, 9247; Vanelle, P. et al., TL,
35, 3305.
R
/
X + (
R
NO,
"k
C0 2 Me
*R
C0 2 Me
DBU, MeCN
C0 2 Me
R
C0 2 Me
70-95%
I.B.3-4 Falck, J.R., Mioskowski, C. et al., TL, 35, 5449, 5453.
R
1
O
R
1
R
+ Me 2 S
+ -CH 2 '
OH
THF, -10°C^rt
R
R'
R
z
45-96%
I.B.3-5 Anand, N. et al., TL, 35, 2951; Terashima, S. et al., TL, 35,
2207.
l.Zn
2.
C\ N
+
OMe
Me MeS0 4 '
63%
ORGANIC SYNTHESIS—1995
I.B.3-2 Mai, D. et al., JCS(Pl), 1115; see also: Hellwinkel, D. et al., S,
973; Abenhaim, D., SC, 24, 1199.
X - r
s + RCHO '
BuOLi
>
X J ^ Y " ^
R
-60°C
l < ! ! ! ^ C O î H
40-54%
I.B.3-3 Ballini, R. and Rinaldi, A., TL, 35, 9247; Vanelle, P. et al., TL,
35, 3305.
R
/
X + (
R
NO,
"k
C0 2 Me
*R
C0 2 Me
DBU, MeCN
C0 2 Me
R
C0 2 Me
70-95%
I.B.3-4 Falck, J.R., Mioskowski, C. et al., TL, 35, 5449, 5453.
R
1
O
R
1
R
+ Me 2 S
+ -CH 2 '
OH
THF, -10°C^rt
R
R'
R
z
45-96%
I.B.3-5 Anand, N. et al., TL, 35, 2951; Terashima, S. et al., TL, 35,
2207.
l.Zn
2.
C\ N
+
OMe
Me MeS0 4 '
63%