SYNTHESIS OF HETEROCYCLES
301
IV.K.6-5 Hoomaret, G. et al., TL, 35, 9767.
P h ^ ^ O ^ O
1. NaN 3 ,DMF
C r S ^ T ^ C I
2. EtOH, Δ
p h
IV.K.6-6 Iwata, C. et al., CC, 230.
(MeO) 2 HC— N ^ ^ S
RiR 2 NH (3 eg) ^ j ^ ' ^ N
[j
toluene, reflux
[I
J
N C N
^ N ^ ^ N R i R i
28-90%
IV.K.6-7 Kiselyov, A.S. and Strekowski, L., TL, 35, 207.
KOCN/RCN
^ . ^
AA.
χe r
N ' "R
30-41%
IV.K.6-8 Fields, S.C. et al., JOC, 59, 8284.
1. (COCI) 2 ,Et 2 0
2. TEA, EtOH
H
P ~ \
Ri—^
^
^ — S M e
N M e 2
3. NaN0 2 ,AcOH
„
+ r
R 2
N—N
K 2
H 2 NHN
l
, „ „ „ «
x
15-37%
SMe
H 2 NHN
301
IV.K.6-5 Hoomaret, G. et al., TL, 35, 9767.
P h ^ ^ O ^ O
1. NaN 3 ,DMF
C r S ^ T ^ C I
2. EtOH, Δ
p h
IV.K.6-6 Iwata, C. et al., CC, 230.
(MeO) 2 HC— N ^ ^ S
RiR 2 NH (3 eg) ^ j ^ ' ^ N
[j
toluene, reflux
[I
J
N C N
^ N ^ ^ N R i R i
28-90%
IV.K.6-7 Kiselyov, A.S. and Strekowski, L., TL, 35, 207.
KOCN/RCN
^ . ^
AA.
χe r
N ' "R
30-41%
IV.K.6-8 Fields, S.C. et al., JOC, 59, 8284.
1. (COCI) 2 ,Et 2 0
2. TEA, EtOH
H
P ~ \
Ri—^
^
^ — S M e
N M e 2
3. NaN0 2 ,AcOH
„
+ r
R 2
N—N
K 2
H 2 NHN
l
, „ „ „ «
x
15-37%
SMe
H 2 NHN