5032
N. Yamazaki et al. / Tetrahedron Letters 42 (2001) 5029–5032
Me
CO2H
DCC, DMAP
CH2Cl2
NH2
+
Y
XMe
15: Y = Cl
17: Y = H
13d: X = O
13f: X = S
Me
O
Me
DIBAL-H
N
H
N
H
CH2Cl2, rt
Y
Y
XMe
XMe
16: X = O, Y = Cl (95%)
18: X = S, Y = H (92%)
1: X = O, Y = Cl (71%)
2: X = S, Y = H (81%)
Scheme 3.
References
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.
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