REDUCTIONS
215
III.F.1-8 DiVona, M.L. et al., T, 50, 2949.
Zinc-Promoted Reactions. 8. The Effect of Ring Strain in the
Reduction of 1,2-Dibenzoylcycloalkanes.
III.F.1-9 Takahashi, K. et al., BCJ, 67, 1107.
Sn0 2 ,300°C
R-C0 2 H — 2 - ro anol *
R "
M e +
R -
C H 2
O H
R = Ar
65-98 %
1-16 %
R = alk
trace
51-69 %
IILF.1-10 Pedregal, C. and Ezquerra, J., 7X, 35, 2053.
I
V
l:LiEt 3 BH
Ί V
O ^ ^ / ^ C O î E t 2 : B F 3 O E t /
C > ^ C 0 2 E t
^
3: Et 3 SiH
f
Boc
Boc 7 8 %
III.F.1-11 Matsuki, K. et al., CPB, 42, 9; see also: Winterfeldt, E. et al.,
CB,127, 2505.
Ό
52-72 %, 64-99 % e.e.