References
1a
Levitzki A.
Gazit A.
Science
1995,
267:
1782
1b
Dixon RA.
Ferreira D.
Phytochemistry
2002,
60:
205
2
Traxler P.
Green J.
Mett H.
Séquin U.
Furet P.
J. Med. Chem.
1999,
42:
1018
3a
Stille JK.
Angew. Chem., Int.
Ed. Engl.
1986,
25:
508
3b
Farina V.
Krishnamurthy V.
Scott WJ.
Org.
React.
1997,
50:
1
4a
Miyaura M.
Yanagi T.
Suzuki A.
Synth. Commun.
1981,
11:
513
4b
Miyaura M.
Suzuki A.
Chem. Rev.
1995,
95:
2457
4c
Suzuki A.
J.
Organomet. Chem.
1999,
576:
147
5a
Zielske AG.
J. Org. Chem.
1987,
52:
1305
5b
Kotsuki H.
Kobayashi S.
Suenaga H.
Nishizawa H.
Synthesis
1990,
1145
5c
Schio L.
Lemoine G.
Klich M.
Synlett
1999,
1559
6
Kiely JS.
Laborde E.
Lesheski LE.
Bucsh RA.
J. Heterocycl.
Chem.
1991,
28:
1581
7a
Croisy M.
Huel C.
Bisagni E.
Heterocycles
1997,
45:
1683
7b Joseph B, Darro F, Guillaumet G, Kiss R, and Frydman A. inventors; PCT
Int. Appl., WO 0112607.
; Chem. Abstr. 2001, 134, 193348
8
Pelter A.
Ward RS.
Whalley JL.
Synthesis
1998,
1793
9 Physical data of 4a:
mp 184-185 °C (EtOAc); IR (KBr): 1628, 1593, 1513
cm-1; 1H NMR (250
MHz, CDCl3): δ 3.76 (s, 3 H, NCH3),
3.81 (s, 3 H, OCH3), 3.94 (s, 3 H, OCH3), 6.71
(s, 1 H, Ar-H), 6.74 (s, 1 H, Ar-H), 6.89 (d, 2 H, J = 8.5 Hz,
Ar-H), 7.51 (d, 2 H, J = 8.5
Hz, Ar-H), 7.52 (s, 1 H, =CH); 13C
NMR (62.90 MHz, DMSO-d
6
): δ 41.2, 55.1, 56.4, 99.5,
106.7, 113.2, 113.4 (2), 121.1, 127.2, 129.8 (2), 143.0, 143.1,
149.0, 158.3, 160.9, 172.9; MS (IS): m/z 444 (MH+). Physical
data of 4b: mp 179-180 °C
(EtOAc); IR (KBr): 1630, 1610, 1592, 1560, 1515 cm-1; 1H
NMR (250 MHz, CDCl3): δ 3.78 (s, 3 H, NCH3),
3.93 (s, 3 H, OCH3), 4.05 (s, 3 H, OCH3),
6.85 (d, 2 H, J = 8.8 Hz, Ar-H),
6.98 (d, 1 H,
J = 8.8
Hz, Ar-H), 7.03 (d, 1 H, J = 8.8
Hz, Ar-H), 7.46 (s, 1 H, =CH), 7.53 (d, 2 H, J = 8.8 Hz, Ar-H); 13C
NMR (62.90 MHz, DMSO-d
6
): δ 46.3, 54.4, 55.6,
110.8, 112.8 (2), 116.1, 121.1, 122.4, 125.9, 128.9 (2), 132.7,
141.2, 143.6, 149.2, 158.0, 173.0; MS (IS): m/z 444
(MH+).
10
Carrera GM.
Sheppard GS.
Synlett
1994,
93
11 Typical procedure: To a solution of 4a (100 mg, 0.22 mmol) in anhyd 1,4-dioxane
(10 mL) was added freshly prepared tetrakis(triphenylphosphine)palladium
(17 mg, 0.014 mmol). The solution was stirred at r.t. for 30 min. Phenylboronic
acid (42 mg, 0.34 mmol) diluted in absolute EtOH (2 mL) was then
added, followed immediately by sat aq NaHCO3 (3 mL).
The heterogeneous solution was stirred at reflux for 3 h. After
cooling, palladium catalyst was removed by filtration. Brine solution
was then added, the two layers were separated and the aqueous phase
was extracted with EtOAc (3 × 5 mL). The combined organic extracts
were dried over MgSO4 and evaporated. The crude residue
was purified by flash chromatography on silica gel (CH2Cl2/EtOAc,
9:1) to afford 60 mg (71%) of 7a.
12 Typical procedure: A mixture of triflate 4a (200 mg, 0.45 mmol) and benzylamine
(0.24 mL, 2.20 mmol) in 1,4-dioxane (2 mL) was heated at 100 °C
for 6 h. After cooling, the solvent was evaporated. The crude residue
was purified by flash chromatography on silica gel (petroleum ether/EtOAc/NH4OH
4:6:0.1) to afford 150 mg (83%) of 9.
13 Physical data of 9:
mp 176-177 °C (EtOAc); IR (KBr): 3174, 1632, 1607,
1570, 1557, 1508, 1471 cm-1; 1H
NMR (250 MHz, CDCl3): δ 3.62 (s, 3 H, NCH3),
3.77 (s, 3 H, OCH3), 3.82 (s, 3 H, OCH3),
4.44 (d, 2 H, J = 5.6 Hz, CH2), 5.85
(s, 1 H, Ar-H), 5.87 (s, 1 H, Ar-H), 6.94 (d, 2 H, J = 8.8 Hz,
Ar-H), 7.22-7.33 (m, 3 H, Ar-H), 7.38-7.41 (m,
3 H, =CH + Ar-H), 7.48 (d, 2 H, J = 8.8
Hz, Ar-H), 11.02 (broad t, 1 H, J = 5.6
Hz, NH); 13C NMR (62.90 MHz, CDCl3): δ 41.6,
47.3, 55.2, 55.5, 85.2, 89.7, 108.1, 113.8 (2), 122.0, 127.1, 127.4
(2), 128.1, 128.7 (2), 130.2 (2), 138.8, 140.5, 144.4, 153.8, 158.8,
163.6, 178.9; MS (IS): m/z 401
(MH+); Anal. Calcd for C25H24N2O3:
C, 74.98; H, 6.04; N, 6.99. Found: C, 75.25; H, 5.89; N, 7.13.
14 All new compounds gave satisfactory
spectroscopic (1H NMR, 13C
NMR, MS and IR) and analytical data.
15
Bernotas RC.
Cube RV.
Synth. Commun.
1990,
20:
1209
16a
Garro-Helion F.
Merzouk A.
Guibé F.
J. Org. Chem.
1993,
58:
6109
16b
Jaime-Figueroa S.
Liu Y.
Muchowski JM.
Putman DG.
Tetrahedron
Lett.
1998,
39:
1313
17
Singh SB.
Tetrahedron
Lett.
1995,
36:
2009
18 Physical data of 18:
mp 161-162 °C (EtOAc/petroleum ether);
IR (KBr): 3446, 3381, 1635, 1610, 1569, 1511 cm-1; 1H
NMR (250 MHz, CDCl3): δ 3.62 (s, 3 H, NCH3),
3.82 (s, 3 H, OCH3), 3.84 (s, 3 H, OCH3),
5.92 (d, 1 H, J = 2.2 Hz Ar-H),
5.98 (d, 1 H, J = 2.2 Hz, Ar-H),
6.94 (d, 2 H, J = 8.8 Hz, Ar-H),
7.11 (broad s, 2 H, NH2), 7.40 (s, 1 H, =CH),
7.49 (d, 2 H, J = 8.8 Hz, Ar-H); 13C
NMR (62.90 MHz, CDCl3): δ 41.5, 55.3, 55.5,
87.1, 93.8, 108.4, 113.8 (2), 121.8, 128.1, 130.2 (2), 140.9, 144.2,
153.7, 158.8, 163.2, 179.1; MS (IS): m/z 311
(MH+); Anal. Calcd for C18H18N2O3:
C, 69.66; H, 5.85; N, 9.03. Found: C, 70.01; H, 5.69; N, 8.92.
19
Miki Y.
Hachiken H.
Kashima Y.
Sugimura W.
Yanase N.
Heterocycles
1998,
48:
1