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55249115480
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We have refined the synthesis of 4a to allow large amounts to be prepared directly from [Mo(CO)6] in 58% yield, minimizing losses associated with the isolation and purification of [Et4N, Mo(CO) 3 {HB(pzMe2)3, a mixture of [Mo(CO) 6, 26.0 g, 98.0 mmol) and K[HB(pzMe2)3, 44.0 g, 131.0 mmol) in 1,2-dimethoxyethane (400 mL) was heated under reflux for 4 h and then freed of solvent under reduced pressure. The residue was dissolved in bromoform (100 mL, the solution was treated with mesityldiazonium tetrafluoroborate (23.0 g, 98.0 mmol, and the resulting suspension was stirred for 18 h. The volatiles were removed under reduced pressure, and the solid residue was chromatographed on silica gel with a mixture of dichloromethane and petroleum spirit (10:1) as eluent. The yellow-orange fraction was collected, concentrated, and cooled, 18 °C) to provide yellow crystals, which were isolated by
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19
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55249085751
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General procedure for the generation and electrophilic quenching of la: to a precooled (dry ice/propanone) solution of 4a (0.20 g, 0.37 mmol) in anhydrous THF (10 mL) was added a solution of BuLi (0.15 mL, Aldrich, 2.50 M in hexane, 0.37 mmol, The mixture was stirred for 30 min, treated with the requisite electrophile 0.37 mmol, and then warmed to 0°C and stirred until the completion of the reaction, as indicated by in situ IR spectroscopy. The volatiles were removed under reduced pressure, and the desired product was isolated by extraction with dichloromethane. filtration through diatomaceous earth, dilution with hexane, concentration, and cooling. The products were generally obtained in spectropscopically pure form; however, if necessary, further purification could be effected by column chromatography on silica gel with an increasing dichloromethane/ hexane gradient as eluent
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General procedure for the generation and electrophilic quenching of la: to a precooled (dry ice/propanone) solution of 4a (0.20 g, 0.37 mmol) in anhydrous THF (10 mL) was added a solution of "BuLi (0.15 mL, Aldrich, 2.50 M in hexane, 0.37 mmol). The mixture was stirred for 30 min, treated with the requisite electrophile (0.37 mmol), and then warmed to 0°C and stirred until the completion of the reaction, as indicated by in situ IR spectroscopy. The volatiles were removed under reduced pressure, and the desired product was isolated by extraction with dichloromethane. filtration through diatomaceous earth, dilution with hexane, concentration, and cooling. The products were generally obtained in spectropscopically pure form; however, if necessary, further purification could be effected by column chromatography on silica gel with an increasing dichloromethane/ hexane gradient as eluent.
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3), see: (a) Ahn, S.; Mayr, A. J. Am. Chem. Soc. 1996, 118, 7408.
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Desmond, T.1
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27
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55249115258
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To a solution of 1a (0.37 mmol) in THF (10 mL) prepared as described above11 at-78 °C was added elemental (gray) selenium (30 mg, 0.37 mmol, The mixture was warmed to room temperature with stirring. When all of the elemental selenium had dissolved, iodomethane (0.2 mL, excess) was added and the mixture stirred for a further 30 min. The solvent was removed under reduced pressure and the residue extracted with dichloromethane (2 × 5 mL, The combined extracts were chromatographed on silica gel, with dichloromethane as eluent, to provide an orange band, which was concentrated and cooled, 18 °C) to provide 13a as a red-orange powder. Yield: 0.18 g (83, NMR (298 K, CDCl3, δH 2.31 (s, 3 H, pzCH3, 2.35 (s, 6 H, pzCH3, 2.56 (s, 6 H, pzCH 3, 2.61 (s, 3 H, pzCH3, 5.72 (s, 1 H, pzH, 5.85 (s, 2 H, pzH, δC 269.2 (Mo≡C, 226.2 CO, 151.4, 151.1, 145.0, 144
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max = 60°), 325 parameters, CCDC 693015.
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39649100658
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Caldwell, L.M.1
Hill, A.F.2
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Willis, A.C.4
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