Nitrile Oxides, Nitrones, and Nitronates in Organic Synthesis : Novel ...

O
O
N N
N
O
R R
O
O
L 1 :
N
N N
1 m
O
O
R
N N
KINUGASA REACTION ([2 + 2] CYCLOADDITION) 389
L 1 :
O
a: R = (S)-Pr i
b: R = (S)-Bu s
c: R = (S)-Bu t
d: R = (R)-Ph
e: R 1 = (S)-Bu s ; R 2 = H
f: R 1 = (S)-Bu t ; R 2 = H
g: R 1 = (S)-Bn; R 2 = H
h: R 1 = (S)-Ph; R 2 = H
i: R 1 = (R)-Ph; R 2 = H
j: R 1 = R 2 = (S, R)-C6H4CH2-
O
N N
O
N
O
O
O
N R
O
N N
O
N N
N
O
N
O
R R
L L n: R = H
o: R = Me
L
1 :
R R
L 2 :
L 2 a L 2 d
a: R = (S)-Pr i
b: R = (S)-Bu t
c: R = (R)-Ph
L k: R = (S)-Ph;
l: R = (R)-Ph;
1 :
Fig. 2.47 Chiral oxazoline ligands L 1 and L 2 .
N
N
O
O
R 2
R 1
N
N N
1 p