84
ORGANIC SYNTHESIS—1995
I.B.3-18 Mioskowsky, C. et al., TL, 35, 7943.
R < O
R
x
Li
R
R
R
1
R
15-98%
I.B.3-19 Viehe, H.G. et al., BSB, 102, 645 (1993).
NR 2
»n
+
N R 1 R 2
A, ZO
32-61%
NR'R
1 D 2
« y
N R
'
R 2
JsOH
NR'R
2
A '
U
O'·
NR, Ri
I.B.3-20 Stang, P.J. et al., /ACS, 116, 93.
O
NaS0 2 Ar
I.B.3-24 Ikeda, S. and Sato, Y., JACS, 116, 5974; see also:
Takahashi, T. et al., TL, 35, 5685; Sato, Y. et al., JOC, 59, 6877; see
also: Grubbs, R.H. et al., JACS, 116, 10801.
SnR,
/
3
Me
R
1
R
2
«
Ni(acac) 2
DIBALH, TMSC1
THF, rt, 2h
31-80% O