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16 Benzeneselenenyl bromide was prepared
by the reaction of diphenyldiselenide (1.0 equiv) and bromine (1.0
equiv) in CH2Cl2 at r.t. for 1 hour.
17
General Procedure
for Obtaining 4-Quinolone 4 via Route A
An oven-dried
50 mL round-bottomed flask was charged with a suspension of the
swollen polystyrene-supported selenenyl bromide (Br: 0.99 mmol/g)
resin (1.0 g) in dry CH2Cl2 (20 mL). ZnCl2 (40
mol%) was added. After stirring for 0.5 hour at r.t., substituted
2-aminochalcone 5 (5.0 mmol) was added,
and the reaction was stirred for another 12 hours. The resin 3 was collected by filtration, washed with H2O
(4 × 20 mL), THF-H2O (v/v = 3:1;
2 × 20 mL), THF (2 × 15 mL), MeOH (2 × 15
mL) and CH2Cl2 (2 × 15 mL) and dried
in vacuo. To a flask containing the suspension of the swollen resin 3 in THF (20 mL) was added 30% H2O2 aq
(1.0 mL), and the mixture was stirred for 1 hour at 0 ˚C,
followed by 20 min at r.t. After the reaction, the mixture was filtered, and
the resin was washed with CH2Cl2 (2 × 20
mL). The filtrate was washed with H2O (2 × 10
mL), dried over MgSO4, and evaporated to dryness in vacuo.
1-Benzyl-2-phenyl-4-quinolone (4a)
¹H
NMR (500 MHz, CDCl3): δ = 8.53
(1 H, d, J = 7.8
Hz), 7.56 (1 H, m), 7.45-7.26 (10 H, m), 6.98 (2 H, d, J = 7.3 Hz), 6.56
(1 H, s), 5.33 (2 H, s). ¹³C NMR (125
MHz, CDCl3): δ = 176.81,
155.64, 140.94, 135.98, 135.21, 132.57, 129.74, 128.98, 128.64,
128.01, 127.64, 126.65, 126.49, 125.34, 125.22, 124.09, 117.30,
112.59, 52.36. IR (KBr): νmax = 1608,
1486, 763 cm-¹. HRMS: m/z calcd
for C22H18NO [M + H]+:
312.1388; found: 312.1385.
18
General Procedure
for the Preparation of 2-Phenyl-2,3-dihydroquinolin-4 (1
H
)-one (9)
An
oven-dried schlenk tube was charged with a suspension of the swollen
resin 7 (0.5 g) in dry toluene (10 mL)
under nitrogen atmosphere, and tributyltin hydride (0.291 g, 1.0 mmol)
or allyltributylstannane (0.331 g, 1.0 mmol) and 2,2′-azobisisobutyronitrile
(AIBN, 0.082 g, 0.5 mmol) were added after which the reaction mixture
was heated to 90 ˚C for 2 hours. After cooling,
the suspension was poured into a fritted funnel, and the resin was
washed with CH2Cl2 (2 × 10 mL). The
filtrate was then concentrated and 10% HCl (5 mL) was added,
and the resulting solution was washed with hexanes (3 × 10
mL). The aqueous phase was then neutralized with 10% NaOH
and extracted with Et2O (2 × 10 mL). The combined
organic layers were washed with brine (10 mL), dried over MgSO4,
and concentrated to afford the product 9.
1-Acetyl-2-phenyl-2,3-dihydroquinolin-4 (1
H
)-one (9a)
¹H
NMR (400 MHz, CDCl3): δ = 2.43
(3 H, s), 3.22-3.28 (1 H, m), 3.35-3.40 (1 H,
m), 6.47 (1 H, br), 7.15-7.22 (7 H, m), 7.44-7.48
(1 H, m), 7.93 (1 H, d, J = 7.6
Hz). ¹³C NMR (100 MHz, CDCl3): δ = 193.1,
170.0, 141.7, 137.9, 134.3, 128.5, 127.5, 127.2, 126.7, 126.0, 125.4,
125.0, 54.6, 42.5, 23.3. IR (film): νmax = 1693,
1682, 1663, 1601, 1461, 694 cm-¹. HRMS: m/z calcd for C17H15NO2:
265.1103; found: 265.1100.