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General Procedure
for Sonogashira Coupling of O-Propargylated Benzyl Alcohol with
Aryl Iodide 6a-f: To a solution of aryl iodide (1.0
mmol), Pd(PPh3)2Cl2 (3 mol%), and
CuI (3 mol%) in freshly distilled Et3N was slowly
added a solution of alkyne 3 (1.1 mmol)
in Et3N and the resulting suspension was magnetically
stirred for 6 h. H2O (50 mL) was added to the reaction
mixture, the residue was extracted into EtOAc (4 × 15 mL),
and the extract was dried over anhyd Na2SO4.
Removal of the solvent under reduced pressure gave the crude product,
which was further purified by column chromatography on silica gel
using EtOAc-petroleum ether as eluent to afford pure product.
Analytical Data for 1-[3-(2-Bromo-4,5-dimethoxybenzyl-oxy)prop-1-ynyl]-4-methylbenzene
(6b): colorless solid; mp 54-56 ˚C.
IR (KBr): 808, 1085, 1160, 1211, 1260, 1450, 1508, 2854, 2924 cm . ¹H
NMR (500 MHz, CDCl3): δ = 2.33 (s,
3 H, Me), 3.84 (s, 3 H, OMe), 3.86 (s, 3 H, OMe), 4.44 (s, 2 H,
OCH2), 4.67 (s, 2 H, OCH2), 7.00 (s, 1 H,
ArH), 7.02 (s, 1 H, ArH), 7.10 (d, J = 8.4
Hz, 2 H, ArH), 7.34 (d, J = 7.65 Hz,
2 H, ArH). ¹³C NMR (125 MHz, CDCl3): δ = 21.6,
56.1, 56.3, 58.6, 71.0, 84.3, 86.9, 112.4, 113.4, 115.4, 119.6, 129.1,
129.2, 131.8, 138.7, 148.5, 149.1. MS (EI): m/z 376.4 [M+H]+.
Anal. Calcd for C19H19BrO3: C,
60.81; H, 5.10. Found: C, 60.85; H, 5.07.
15
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19
General Procedure
for the Synthesis of Isochromans 7a-n: Pd(PPh3)4 (3
mol%) and HCOONa (1.5 equiv) were added to a pressure tube
and the tube was flushed with nitrogen. The requisite propargyl
ether (0.4 mmol) dissolved in DMF (4.5 mL) was added, followed by
distilled H2O (1.5 mL). The pressure tube was exposed
to microwave irradiation for 1 min using an unmodified microwave
oven operating at 300 W. The reaction mixture was cooled and was
irradiated again for the same time. After fifteen of such successive irradiations
and cooling sequences, the reaction mixture was diluted with EtOAc.
The organic phase was washed with brine, dried (anhyd Na2SO4)
and concentrated under reduced pressure. The crude product was purified
by chromatogra-
phy (petroleum ether-EtOAc as
eluent) and the yields are shown in Table
[4]
.
Analytical Data for 6,7-Dimethoxy-4-(4-methylbenzylidene)-isochroman
(7b): pale yellow solid; mp 186-188 ˚C.
IR (KBr): 1088, 1109, 1234, 1353, 1457, 1513, 1602, 2844, 2930 cm-¹. ¹H
NMR (500 MHz, CDCl3): δ = 2.36 (s,
3 H, Me), 3.88 (s, 3 H, OMe), 3.94 (s, 3 H, OMe), 4.73 (s, 2 H, OCH2),
4.74 (s, 2 H, OCH2), 6.52 (s, 1 H, ArH), 6.99 (s, 1 H, ArH),
7.12 (d, J = 7.65 Hz, 2 H, ArH),
7.17 (d, J = 8.4 Hz, 2 H, ArH),
7.21 (s, 1 H, =CH). ¹³C NMR
(125 MHz, CDCl3): δ = 21.3, 56.0, 56.1,
66.8, 68.4, 106.1, 107.2, 121.3, 124.8, 127.8, 129.1, 129.2, 131.4,
134.0, 136.8, 148.4, 148.2. MS (EI): m/z 297.50 [M+H]+.
Anal. Calcd for C19H20O3: C, 77.00;
H, 6.80. Found: C, 76.96; H, 6.82.