SYNTHESIS OF HETEROCYCLES
281
IV.K.la-4 Joseph, B. and Rollin, P., JCR(S), 128; Palacios, F. et al., T,
50, 12727; Zhang, L. et al, TL, 35, 3675; Tang, X.Q. and Hu, CM.,
JCS(Pl), 2161.
NNHAr'
I2/CH2CI2
similar heterocycles from hydrazones
—Ar*
73-92% Xr
IV.K.la-5 Baeg, J.-O., and Alper, H., JACS, 116, 1220; Ahlbrecht, H.
and Schmitt, C , 5, 719; Lawrence, R.M., TL, 35, 3767; Schantl, J.G. et
al., H, 37, 1873.
W
AR
R
PdCl 2 (PhCN) 2
\J + ArN=S=NAr
I
R'
PhCH 3 ,130°
S r ^ P T
5 P
s i N 2
52-70% R.
IV.K.la-6 Kawase, M., CC, 2101.
R U±> /
C 0 C F 3
NH
N — /
li
DMF
X\
+ f
R
> 10»
R 2
/ N
O
/
^ O 0
NH 2
IV.K.la-7 Buchi, G. et al., H, 39, 139.
'H,
RCHO
TosMIC
J?
Α
9
83-92%
I 10-80%
R"