4
ORGANIC SYNTHESIS—1995
I.A.1-9 Hirao, T. et al., T, 50, 10207.
^ k / T M S
VO(OEt)Cl 2
R
R
2
R
3 R
4 R
5
32-66%
I.A.1-10 Yoshida, J., Isoe, S. et al., TL, 35, 5247.
9C0 2 Me
«JMS
a n o d i c o x i d a t i o n
OC0 2 Me
R ^ ^ S n B i l · ,
< i ^ \
BU4NCIO4
R
R = C 7 H 15 , Ph
52-94%
I.A.1-11 Enders, D. et al., T, 50, 3349, SL, 792, 1054 and CB, 127,
1707; see also: Augeri, D.J. and Chamberlin, A.R., TL, 35, 5599.
1) LDA, 0°C
I
*RL J
OMe
2) R*X, -110°C
OMe
72-94%, 83->96% de
ORGANIC SYNTHESIS—1995
I.A.1-9 Hirao, T. et al., T, 50, 10207.
^ k / T M S
VO(OEt)Cl 2
R
R
2
R
3 R
4 R
5
32-66%
I.A.1-10 Yoshida, J., Isoe, S. et al., TL, 35, 5247.
9C0 2 Me
«JMS
a n o d i c o x i d a t i o n
OC0 2 Me
R ^ ^ S n B i l · ,
< i ^ \
BU4NCIO4
R
R = C 7 H 15 , Ph
52-94%
I.A.1-11 Enders, D. et al., T, 50, 3349, SL, 792, 1054 and CB, 127,
1707; see also: Augeri, D.J. and Chamberlin, A.R., TL, 35, 5599.
1) LDA, 0°C
I
*RL J
OMe
2) R*X, -110°C
OMe
72-94%, 83->96% de