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LETTER
(10) In a typical procedure, a mixture of an appropriate b-
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hydroxypropionaldehyde (0.01 mol) and a 2-tetralone
analogue (0.0105 mol) were stirred in AcOH (ca. 50 mL) at
0 °C. Freshly prepared dry HCl gas was briskly passed
through the mixture for 1 h. Stirring was continued at r.t. for
17 h. Then, AcOH was removed under vacuum and the
residue was extracted with CH2Cl2 (2 × 100 mL) and H2O (2
× 50 mL). The organic layer was dried and rotary evaporated
to dryness to yield crude product, which was purified by
column chromatography (silica gel mesh size 230–240;
eluent 1–2% EtOAc–hexane). Spectroscopic Data for a
Representative Compound
Compound 4o: 1H NMR (300 MHz, CDCl3): d = 1.53 (3 H,
s, CH3), 3.10 and 3.46 (1 H each, d, J = 16.2 Hz, ArCHa and
ArCHb), 3.97 (3 H, s, OCH3), 4.19 and 4.33 (1 H each, d,
J = 10.5 Hz, OCHa and OCHb), 6.99 (1 H, d, J = 8.7 Hz,
ArH), 7.08 (1 H, m, ArH), 7.15 (1 H, s, ArH), 7.32 (1 H, d,
J = 6.9 Hz, ArH), 7.39–7.50 (4 H, m, ArH), 7.61 (1 H, d,
J = 8.7 Hz, ArH), 7.73 (1 H, d, J = 8.7 Hz, ArH) ppm. 13
C
NMR (75 MHz, CDCl3,): d = 25.00, 35.84, 36.36, 55.75,
74.42, 101.48, 112.70, 115.65, 116.56, 124.80, 126.31,
127.09, 127.91, 129.03, 130.51, 134.82, 146.17, 152.33,
158.81 ppm. IR (KBr): n = 2963, 1624, 1515, 1233, 1222,
1028, 830, 699 cm–1.
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Synlett 2007, No. 20, 3127–3130 © Thieme Stuttgart · New York