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OH
O
O
O
H
2
, Pd/C
H
N
H
N
O
O
OH
H
N
H
N
BocHN
H
H
O
EtOH
rt, overnight
77%
BocHN
H
H
O
O
O
O
O
O
Boc-Tyr(Bn)-Gly-Gly-Phe-Leu-OBn
Boc-Tyr-Gly-Gly-Phe-Leu-OH
HCl
g
,
2 h
quantitative
OH
O
O
N
N
OH
HCl·
H
2
N
H
H
O
O
O
Leu-enkephalin
(9 steps, 46% overall yield)
Scheme 6.20
Synthesis of Leu-enkephalin.
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