|
|
wt/vol
|
MW
|
moles
|
density
|
equivs.
|
yield
|
|
I
|
5.934 g
|
252.27
|
0.0235
|
|
1.0
|
|
|
II
|
-
|
-
|
-
|
|
|
|
|
III
|
3.001 g
|
-
|
-
|
|
|
|
|
IV
|
130 mL
|
-
|
-
|
|
|
|
|
V
|
4.410 g
|
222.28
|
0.0198
|
|
|
(84%)
|
Procedure: Parr
bottle, Parr shaker
Dissolved
5.934 g of I in 130 mL of absolute
EtOH. Carefully added 3.001 g of
10% Pd/C. The mixture was then
hydrogenated at 50 psi for 45 min.
TLC (30:70 EtOAc-hexanes, UV) showed product spot at Rf 0.47. The reaction mixture was then filtered
through Celite and the solvent was removed by rotary evaporation. The product was isolated by flash
chromatography on silica using 30:70 EtOAc-hexanes as eluant. The product was a white solid.
1H NMR (CDCl3,
300 MHz) d 7.10 (dt, J = 7.7, 1.1 Hz, ArH, 1H), 7.03 (d, J = 7.7 Hz, ArH, 1H), 6.68 (m, ArH, 2H), 4.81 (br, NH,
1H), 4.23 (m, ArCH2, NH2, 4H), 1.44 (s, C(CH3)3,
9H).