SYNTHESIS OF HETEROCYCLES
229
IV.C-5 Ishibashi, H. et al., SL, 445.
üPh
SPh
Bu 3 SnH
p /
H
Me
AIBN
SPh
O
77% 2.3:1
N
\ X M e
IV.C-6 Dumas, S. and Hegedus, L.S., JOC, 59, 4967.
jOMe
Me
R
2
^
λ
R i
( C O ) 5 C r = <
ÌP —
leQ
R
1
24-81%
IV.C-7 Alcaide, B. et al., JOC, 59, 7994; Cainelli, G. et al., S, 805; van
Koten, G. et al., RTC, 113, 567.
RL ^R
2
V
R'
R
J
RÎw ^R
2
LDA
"R
4
C0 2 Me
THF
-78 °C to rt
60-99%
IV.C-8 Georg, G.I. and Wu, Z., TL, 35, 381; Alcaide, B. et al., JOC, 59,
8003; Maiorana, S. et al., TA, 5, 809.
Phœ
~J*^n N.
TEA
rt- - r i
N \ . . *
M e
P h "
R
υ
C l
^
R=H,Me
PhCW
^ R
1
71-72% R
(83:17 over all eis)