反应详情

Methyl 3-tert-butyldimethylsilyloxy-4-methoxybenzoate (170 mg, 0.57 mmol, prepared in Example 1, Step 2 above) and (1R)-(+)-camphor (Aldrich, 120 mg, 0.79 mmol) were mixed and dissolved in anhydrous tetrahydrofuran (THF, 1.98 ml) and 15 coupled as described in the procedure of Example 1, Step 3, above, by using titanium trichloride (1.9 g, 12.32 mmol), LAH (0.22 g, 5.80 mmol) and THF (13.8 ml). The product was purified on a preparative TLC plate (silica gel). Development with hexane/ethyl acetate (10:1) gave the title compound as a mixture of two isomers (58 mg). NMR(δ): 0.18 (s, 6H), 1.00 (s, 15H), 1.29 (s, 3H), 3.23 (s, 1H, minor isomer), 3.30 (s, 2H, major isomer), 3.85 (s, 3H).

1. customThe product was purified on a preparative TLC plate (silica gel)