BÀI TẬP
TỔNG HỢP HÓA HỮU CƠ
LUYỆN THI HSG
QUỐC GIA (tập 2)
Thạc sĩ Phạm Công Nhân
TAXOL
Fukuyama Group - Group Meeting Problems
01/09/2002
1
Li
Me
O
TMSO
MeO
THF
–78 °C;
TMSCl (1.5 eq);
25 °C; HCl aq
H
2
H
0.1 eq PhSH
0.1 eq PhSNa
C16H20O2
Me
O
O
THF
reflux
12 hr
H
O
MeN
O
MeO
Cl
O
lutidine
1) MeAlCl2, CHCl3
2) NaBH4, MeOH, 63% (2 steps)
toluene
68%
3) MsCl, Et3N, 94%
4) t-BuOK, THF, reflux, 86%
MeO
3
CrCl2 (8 eq)
TMSCl (6 eq)
H2O (1 eq)
O
R1CHO
NMe
+
R2
4
N
N
R1
O
R2
THF
25 °C, 24 h
Ph
OEt
O
OEt
Ph
benzene
reflux
H
67%
5
O
HN
TESO
Ar
CO2Me
1) Boc2O, DMAP
Et3N, CH2Cl2
Ar-C7H8NO
2) TBAF, THF-H2O
3) DMSO, H2O, 130 °C
1) Me3SiOK
toluene, 70 °C;
aq NH4Cl
2) Pb(OAc)4
t-BuOH, 50 °C
Cl
Ar =
N
NHBoc
Ar
O
Fukuyama Group - Group Meeting Problems
01/16/2002
1
O
PhSH
aq HCHO
Et3N
O
Me
EtOH
O
1) Li/NH3
THF, t-BuOH;
TMSCl, Et3N
O
Me4NBH(OAc)3
H
MeCN-AcOH
–40 °C
2) Sc(OTf)3
aq HCHO
THF
HO
O
Me
Me
OH
2
SmI2 (0.1 eq)
Ph OH
Ph
O
H
Ph
Ph OH
(4.0 eq)
O
Ph
PhMe, 80 °C, 4 hr
95%
O
O
Ph
3
DNs
N
1) cyclopentadiene, NaIO4, MeOH, H2O
2) DNsCl, pyridine, CH2Cl2
NH2 O
NHOH
3) Pd(PPh3)4, THF, ∆
N
O
OH
4
+ n-Bu
Ph
MeOTf
2,6-di-t-Bu-pyridine
CH2Cl2, 0 °C;
1) MS 4Å
CH2Cl2
OHC
2) Oxone®, NaHCO3
MeCN-H2O
54%
NH2
A
O
n-Bu
aq NaHCO3
55%, >98% ee
5
Cr(CO)5
benzene
N
Ph
reflux
Ph
O
OHC
N
Fukuyama Group - Group Meeting Problems
01/23/2002
O
1
CO2Me
N2
O
O CO Me
2
O
Rh2(OAc)4 (1 mol%)
CH2Cl2
reflux, 54%
O
O
2
NO2
NO
hν
+
ROH
OR
CHO
OAc
OAc
3
Hg(OTf)2 1.2 eq
tetramethylurea
H
O
CH3CN
r.t., 5.5 h;
NaCl
HO
ArCO2
Ar = p-nitrophenyl
HgCl
22%
4
Ph
TMS
DMAD (2.0 eq)
TMS
Et2O
–78 °C to rt
16 hr
79%
N
A
C26H35NO8Si2
TMS
n-Bu
N
TMS
N
TMS
(1.0 eq)
TMS
O
n-Bu
MeO2C
Et2O
–78 °C to rt
24 hr
33%
MeO
5
Ph
Ph
N3
CO2Me
OMe
1) benzene, 80 °C
N
O
2) PhCHO, DABCO (1.5 eq)
Ph
CO2Me
CO2Me
Ph
O
TMS
N
TMS
Fukuyama Group - Group Meeting Problems
01/30/2002
1
AlCl3 (2.0 eq)
SiMe3
N
OH
CH2Cl2
–10 to 0 °C
84%
NO2
O
O
OH
2
POCl3, 50 °C
NMe
CHO
MeO
86%
OMe
MeO
N
Me
Cl
O
3
O
O
Pd(dba)2, dppp
CO (6 atm)
DMF
N
H
NO2
74%
4
CN
CN
NC
i-PrNH2, hυ
NH3, CH3CN-H2O
MeO
NHi-Pr
MeO
5
O
OTIPS
Me
N
PMP
O
PMP = p-C6H4OMe
1) ClTi(Oi-Pr)3, c-C5H9MgCl
THF, rt, 90%
2) SiO2, CF3CH2OH, rt;
P(OEt)3, rt, 68%
H
OH
H
TIPSO
H
stereoisomers