258
ORGANIC SYNTHESIS—1995
IV.F-23 Wasserman, H.H. and Blum, CA., TL, 35, 9787.
H 2 NR 4
OtBu CH 2 C1 2
R 3 ^ ' —
N
C0 2 tBu
32-72% R 4
IV.F-24 Furstner, A. et al., CB, 127, 1125.
Ri
Ti-graphite w
JP
X = O, NH
X — \
"X'
R,
R2
66-79%
/
R l
IV.F-25 Iwao, M., H, 38, 45.
X
1. tBuLi
r
Y
Boc
Sila-Pummerer
SPh
Y
Boc
27-54%
IV.F-26 Tietze, L.F. and Grote, T., JOC, 59, 192.
1. tBuLi
2. Cp 2 Zr(CH 3 )Cl
3. I 2
O B 11
OBn
65%