344
ORGANIC SYNTHESIS—1995
VI.A.5-6 Kitagawa, T. et al., CPB, 42, 1655, 1931; Chancellor, T. and
Morton, C , S, 1023.
R'
R*
I
OHC-im
I
R
H
R ' ^CHO
67-98 %
VI.A.5-7 Frauenrath, H. et al., LA, 931.
1: R2-C1
R 3
R4
R5
I
HO'
^ ^
S ' R S
R 2
55-93%
1: TMSOTf
2: K 2 C0 3 , H 2 0
R2
"
R2
Rl
- Λ ,
Rl
^A,
*N ^ O
N
^ O
, ^ / C H O
, ^ s ^ ^CHO
R3^ ^ V ^
R 3 ^ ^
R5-^
35-67 %
R5
1:1 to 98:2
VI.A.5-8 Marchese, G. et al., SL, 719; see also: Hoeg-Jensen, T. et al.
JOC, 59, 1257.
S
S
Jî
RMgX, NiCI 2 (dppe) ^
fì
C l
/ ^ N M e 2
THF, rt
**
R
NMe 2
75-90 %
ORGANIC SYNTHESIS—1995
VI.A.5-6 Kitagawa, T. et al., CPB, 42, 1655, 1931; Chancellor, T. and
Morton, C , S, 1023.
R'
R*
I
OHC-im
I
R
H
R ' ^CHO
67-98 %
VI.A.5-7 Frauenrath, H. et al., LA, 931.
1: R2-C1
R 3
R4
R5
I
HO'
^ ^
S ' R S
R 2
55-93%
1: TMSOTf
2: K 2 C0 3 , H 2 0
R2
"
R2
Rl
- Λ ,
Rl
^A,
*N ^ O
N
^ O
, ^ / C H O
, ^ s ^ ^CHO
R3^ ^ V ^
R 3 ^ ^
R5-^
35-67 %
R5
1:1 to 98:2
VI.A.5-8 Marchese, G. et al., SL, 719; see also: Hoeg-Jensen, T. et al.
JOC, 59, 1257.
S
S
Jî
RMgX, NiCI 2 (dppe) ^
fì
C l
/ ^ N M e 2
THF, rt
**
R
NMe 2
75-90 %