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Typical Procedure
for the Preparation of Polystyrene-Supported Allyl Selenide (2)
To
a suspension of the swollen polystyrene-supported selenenyl bromide
(1, Br: 0.99 mmol/g, 2.5 g) in
dry THF-DMF (v/v = 5:1,
30 mL) was added NaBH4 (5 mmol) under nitrogen atmosphere
at 40 ˚C. After stirring for 8 h at 40 ˚C, 3-bromoprop-1-ene
(5.5 mmol) was added dropwise under nitrogen atmosphere, and stirred
for another 12 h. The resin 2 was collected
by filtration, washed with THF (2 × 20 mL), MeOH (2 × 20
mL), and CH2Cl2 (2 × 20 mL), and
dried in vacuum.
<A NAME="RW76411ST-28">28</A>
Typical Procedure
for the Preparation of 6-Methyl-4-phenyl-3-(phenylselenyl)-2
H
-chromen-2-one [(±)-6]
To
an oven-dried flask (25 mL) was added polystyrene-supported succinimidyl
selenide (PSSS, 0.27 g, 1.05 mmol) in dry CH2Cl2 (10
mL) under nitrogen atmosphere, and the solution was cooled at -78 ˚C.
Trimethylsilyl trifluoro-methanesulfonate (TMSOTf, 0.022 g, 0.1
mmol) was added. After stirring for 0.5 h at -78 ˚C, p-tolyl cinnamate (0.238 g, 1.0 mmol)
was added under nitrogen atmosphere. The mixture was stirred for
another 2 h at -78 ˚C and then stored in a freezer
at -20 ˚C for 8 h. Saturated aq NaHCO3 (5
mL) was poured into the flask to quench reaction mixture. The organic
phase was separated, and the aqueous phase was extracted with fresh
portion of CH2Cl2 (25 mL). The extracts were
combined, washed with H2O, and dried over MgSO4. After
filtering and concentrating under reduced pressure by rotary evaporation
at r.t, the oily residue was subjected to preparative TLC on silica
gel with EtOAc-light PE (1:9) as eluent to give 197 mg
of (±)-6 (50% isolated
yield).
<A NAME="RW76411ST-29">29</A>
General Procedure
for the Preparation of 2
H
-Chromen-2-one (5)
To a suspension
of the swollen resin 2 (1.0 g) in dry CH2Cl2 (15
mL) was added NCS (0.668 g, 5.0 mmol) at 0 ˚C. The mixture
was stirred for 0.5 h at 0 ˚C and 2 h at r.t. After filtrating
and washing with dry CH2Cl2 (3 × 15
mL), PSSS was suspended with dry CH2Cl2 (15
mL) and cooled to -78 ˚C. TMSOTf (0.022 g, 0.10
mmol) was added. After stirring for 0.5 h at -78 ˚C,
substituted phenyl acrylate 3 (5.0 mmol) was
added under nitrogen atmosphere. The suspension was stirred for
another 2 h at -78 ˚C and then stored in a freezer at -20 ˚C
for 8 h. Saturated aq NaHCO3 (5 mL) was poured into the
flask to quench the reaction mixture. 3-Polystyrene-supported seleno-3,4-2H-chromen-2-one [(±)-4] was collected by filtration,
washed with THF (2 × 20 mL), Et2O (2 × 20
mL), THF-H2O (3:1, 2 × 20 mL), H2O
(2 × 20 mL), THF (2 × 20 mL), benzene (2 × 20
mL), MeOH (2 × 20 mL), and CH2Cl2 (2 × 20
mL), and dried under vacuum. The washed resin (±)-4 was suspended in THF (15 mL). To the mixture
was added 30% aq H2O2 (1.2 mL). The
mixture was stirred for 1 h at 0 ˚C and then for another
20 min at r.t. The mixture was filtered, and the resin was washed
with CH2Cl2 (2 × 15 mL). The filtrate
was washed with H2O (2 × 30 mL), dried over
MgSO4, and evaporated to dryness in vacuum to afford
2H-chromen-2-ones 5.
<A NAME="RW76411ST-30">30</A>
Typical Procedure
for the Preparation of 4-Biphenyl-2
H
-chromen-2-one (10)
To a suspension
of the swollen resin (±)-4d (0.5
g) in dry THF (15 mL) was added Pd(OAc)2 (0.0056 g, 0.025
mmol), phenylboronic acid (0.61 g, 5.0 mmol), KF (0.58 g, 10.0 mmol),
and 2-(dicyclohexylphosphino)biphenyl [o-(biphenyl)PCy2] (0.175
g, 0.5 mmol) under a nitrogen atmosphere. The reaction mixture was
stirred at r.t. for 24 h. Resin (±)-9 was
collected by filtration, washed with THF (2 × 20 mL), Et2O
(2 × 20 mL), THF-H2O (3:1, 2 × 20
mL), H2O (2 × 20 mL), THF (2 × 20 mL),
benzene (2 × 20 mL), MeOH (2 × 20 mL), and CH2Cl2 (2 × 20
mL), and dried in vacuum. The washed resin (±)-9 was suspended in THF (15 mL). To the
mixture was added 30% aq H2O2 (1.5
mL) and stirred for 1.5 h at 0 ˚C, and stirred for another
20 min at r.t. The mixture was filtered, and the resin was washed
with CH2Cl2 (2 × 15 mL). The filtrate
was washed with H2O (2 × 30 mL), dried over
MgSO4, and evaporated to dryness under vacuum to afford
4-biphenyl-2H-chromen-2-one (10).
<A NAME="RW76411ST-31">31</A>
6-Methyl-4-phenyl-3-(phenylselenyl)-2
H
-chromen-2-one [(±)-6]
Yellow
oil. ¹H NMR (400 MHz, CDCl3): δ = 7.35-7.07
(11 H, m), 6.86 (2 H, dt, J
1 = 8.4
Hz, J
2 = 2.8
Hz), 4.58 (1 H, d, J = 10.8
Hz), 4.04 (1 H, d, J = 10.4
Hz), 2.33 (3 H, s). ¹³C NMR (100 MHz,
CDCl3): δ = 170.10,
148.59, 135.90, 135.65, 135.47, 129.97, 129.07, 128.96, 128.78,
128.54, 128.44, 127.79, 121.12, 79.10, 51.07, 20.96. IR (KBr): ν = 1741,
1496, 1431, 1208, 1010, 736, 693 cm-¹.
HRMS:
m/z [M]+ calcd
for C22H18O2Se: 394.0472; found:
394.0470.