SYNTHESIS OF HETEROCYCLES
299
IV,K,g t
Heterocvcles with 1 O and 1 S
IV.K.5-1 Roush, W.R. et al., TL, 35, 4931 and 4935.
M e ^
Me^ ^OH
^ '
1. PhNH 2 (2eq)
y o
2. 1NHC1
IV.K.5-2 Tominaga, Y. et al., TL, 35, 3555.
IV.K.5-3 Marson, CM. et al., CC, 1195.
Pli
X
OH
TsNSO
P h V
f ^ ?
BF 3 Et 2 0
A/L
Ph-H,10°
6 9 %
U
IV.K.5-4 Kim, S. and Cho, CM., H, 38, 1971; see also: DeVoss, J.J.
and Sui, Z., TL, 35, 49.
X'
65-86%