SYNTHESIS OF HETEROCYCLES
269
IV.H-3 Hiemstra, H., Speckamp, W.N. et al., T, 50, 7115.
,Et
CI
-OAc
SnClj
vT
C0 2 Me
68%
C ° 2
M e
Et
IV.H-4 Masaki, Y. et al., H, 38, 2165.
BF 3 »Et 2 0
R
CH 2 CI 2
OR
1
Ό
*OR*
0-82%
IV.H-5 Gravel, D. et al., TL, 35, 8981.
" ^ 7
hv, 350 nm
PhS I
OH
Ph 2 CO, PhSH
CH 3 CN
OH
63%
IV.H-6 Horita, K., Yonemitsu, O. et al., SL, 38; see also: Burke, S.D. et
al., TL, 35, 703; Prandi, C. and Venturello, P., JOC, 59, 3494.
EtO,
,TES(
/
\
P
!X>,Et
TBAF
»
THF
Η,Ο
^^u^
H 96%
269
IV.H-3 Hiemstra, H., Speckamp, W.N. et al., T, 50, 7115.
,Et
CI
-OAc
SnClj
vT
C0 2 Me
68%
C ° 2
M e
Et
IV.H-4 Masaki, Y. et al., H, 38, 2165.
BF 3 »Et 2 0
R
CH 2 CI 2
OR
1
Ό
*OR*
0-82%
IV.H-5 Gravel, D. et al., TL, 35, 8981.
" ^ 7
hv, 350 nm
PhS I
OH
Ph 2 CO, PhSH
CH 3 CN
OH
63%
IV.H-6 Horita, K., Yonemitsu, O. et al., SL, 38; see also: Burke, S.D. et
al., TL, 35, 703; Prandi, C. and Venturello, P., JOC, 59, 3494.
EtO,
,TES(
/
\
P
!X>,Et
TBAF
»
THF
Η,Ο
^^u^
H 96%