Chlorotrimethylsilane → HCID 11461188, compound

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Reaction Steps

(66, 67). To 32 (247 mg, 1.02 mmol) dissolved in hexanes was added triethylamine (0.23 mL, 1.68 mmol) and trimethylsilylchloride (0.21 mL, 1.64 mmol) and the solution was allowed to stir at room temperature for 4 h. The mixture was filtered over celite and evaporated to provide 5-methyl-5-octyl-4-trimethylsilanyloxy-5-H-thiopen-2-one. To a solution of TiCl4 (0.7 mL, 0.7 mmol) in CH2Cl2 (1.95 mL) at −78° C. was added acetaldehyde (54 μL, 0.97 mmol) and this solution was allowed to stir for 5 min at −78° C. Then, 5-methyl-5-octyl-4-trimethylsilanyloxy-5-H-thiopen-2-one dissolved in CH2Cl2 (0.4 mL) was cannulated into TiCl4/acetaldehyde solution giving a bright orange color. This mixture was allowed to warm and stir for 20 min at 0° C. The mixture was poured into NH4Cl(sat) (15 mL) and extracted with CH2Cl2 (3×15 mL). The organics were combined, dried (MgSO4), filtered and evaporated. Flash chromatography (10% EtOAc/Hexanes) provided pure 66 (34 mg) and 67 (24 mg) (50%). (66) 1H NMR (300 MHz, CDCl3) δ 0.86 (t, J=6.9 Hz, 3H), 1.05-1.08 (m, 1H), 1.24 (bs, 11H), 1.49 (d, J 6.5 Hz, 3H, rotamer) 1.55 (d, J=5.2 Hz, 3H, rotamer), 1.62 (s, 3H), 1.78-1.82 (m, 2H), 4.68 (q, J=6.5 Hz, 1H, rotamer), 5.04 (q, J=5.2 Hz, 1H, rotamer). HRMS (ES) m/z calculated for C16H28O3SNa+ (M+CH2+Na+) 323.1660 obsd. 323.1660.

Provenance & Evidence