3-(Dimethylamino)phenol → 6-[[3-(N,N-dimethylamino)-phenyloxy]methyl]-1,2-dithiin

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a stirred solution of 200 mg (0.688 mmol) of 3-(hydroxymethyl)-6-[(tert-butyldimethylsilyloxy)methyl]-1,2-dithiin (U.S. Ser. No. 08/212,096) in 2 mL dry THF was added a solution of 3--N,N-dimethylaminophenol (190 mg, 1.376 mmol) in 2 mL THF, followed by addition of (220 mg, 0.839 mmol) triphenylphosphine. The resulting solution was cooled to 0° C., then 140 μL (155 mg, 0.890 mmol) of diethylazodicarboxylate was added, and the reaction mixture was kept at 0°-5° C. for 3 h until TLC analysis showed the reaction to be complete. For isolation of the products the reaction mixture was chromatographed directly on silica gel column, using ethyl acetate-hexane, 1:3 to yield 3-[tert-butyldimethylsilyloxy)methyl]-6-[[3-(N,N-dimethylamino)-phenyloxy]methyl]-1,2-dithiin (115 mg, 41.1%); 1H-NMR (CDCl3) δ7.3 (bs, 1 H), 7.1 (bs, 1 H), 6.60 (d, J=2.4, 1 H), 6.52 (bd, J=7.27 1 H), 6.42 (d, J=6.0, 1 H), 6.34 (d, J=6.0, 1 H), 4.60 (s, 2 H), 4.26 (s, 2 H), 2.65 (s, 6 H), 0.88 (s, 9 H), 0.07 (s, 6 H).

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