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According to the method described for the synthesis of 207d, 206h (51.0 g, 179 mmol) was reacted with 3,4-dihydro-2H-pyran (18.80 g, 223 mmol) and p-toluenesulfonic acid hydrate (1.21 g, 6.36 mmol). Filtration through aluminum oxide (370 g) and concentration in vacuo afforded 207h (48.75 g, 76%) as a yellowish oil. 1H NMR (CDCl3): δ 7.35-7.17 (m, 10H), 4.53 (m, 1H), 4.49 (m, 1H), 3.82 (m, 2H), 3.79 (m, 1H), 3.68-3.60 (m, 2H), 3.45-3.35 (m, 2H), 3.32 (t, 4H, J=6.9), 1.82-1.18 (m, 28H), 1.35 (s, 6H). 13C NMR (CDCl3): δ 146.12, 128.11, 126.66, 125.89, 99.18, 99.04, 76.46, 62.02, 61.83, 42.17, 42.07, 38.91, 38.73, 34.12, 32.80, 30.70, 29.04, 25.66, 23.33, 22.97, 22.89, 19.49, 19.39. HRMS (LSIMS, nba): Calcd for C19H30BrO2 (MH+): 369.1429. found: 369.1430.

1. filtrationFiltration
2. concentrationthrough aluminum oxide (370 g) and concentration in vacuo