SYNTHESIS OF HETEROCYCLES
227
IV.B-2 Sauter, F. et al., H, 37, 1879; Kato, K. et al., T, 50, 13335.
R
1
R
2
THF
R ^ R
2
similarly by reduction of azides
41-90%
IV.B-3 Bach, T., TL, 35, 5845; Watt, D.S. et al., JOC, 59, 4677.
TMS
^
R 1
Ì
--Ar r
# " ' R
R
1
™.da°r
OTMS
OT
ArCHO + J L
hv
Ϋ
Z/E 25/75 to >95/5
35-87%, 65->95% ds
IV.B-4 Galatsis, P. and Parks, DJ., TL, 35, 6611; see also: Holton,
R.A. et al., JACS, 116, 1599.
XI
R ^ V ^ O M e l2,NaHC0 3
Vît
MeCN
?
O ,
R* V
^COiMe
R2
44-94%
IV.B-5 Rozwadowska, M.D., TA, 5, 1327.
P] ^
OTs
?
E.OCS 2 K _ ^
^ *
PIT ^r
OTs
Me 2 CO
ÄPhth
r e f l u x ' «
h
80%
> s ^ C 0 2 H
227
IV.B-2 Sauter, F. et al., H, 37, 1879; Kato, K. et al., T, 50, 13335.
R
1
R
2
THF
R ^ R
2
similarly by reduction of azides
41-90%
IV.B-3 Bach, T., TL, 35, 5845; Watt, D.S. et al., JOC, 59, 4677.
TMS
^
R 1
Ì
--Ar r
# " ' R
R
1
™.da°r
OTMS
OT
ArCHO + J L
hv
Ϋ
Z/E 25/75 to >95/5
35-87%, 65->95% ds
IV.B-4 Galatsis, P. and Parks, DJ., TL, 35, 6611; see also: Holton,
R.A. et al., JACS, 116, 1599.
XI
R ^ V ^ O M e l2,NaHC0 3
Vît
MeCN
?
O ,
R* V
^COiMe
R2
44-94%
IV.B-5 Rozwadowska, M.D., TA, 5, 1327.
P] ^
OTs
?
E.OCS 2 K _ ^
^ *
PIT ^r
OTs
Me 2 CO
ÄPhth
r e f l u x ' «
h
80%
> s ^ C 0 2 H