Molybdenum Nitride Complexes with Ph3SiO Ligands Are Exceedingly Practical and Tolerant Precatalysts for Alkyne Metathesis and Efficient Nitrogen Transfer Agents

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• 作者：Martin Bindl ; Robert Stade ; Eike K. Heilmann ; Alexandre Picot ; Richard Goddard ; Alois Frstner
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：July 15, 2009
• 年：2009
• 卷：131
• 期：27
• 页码：9468-9470
• 全文大小：194K
• 年卷期：v.131,no.27(July 15, 2009)
• ISSN：1520-5126

文摘

The molybdenum nitride complex [(Ph₃SiO)₃Mo≡N] (10), which can be conveniently prepared in situ from readily available [(Me₃SiO)₂((Me₃Si)₂N)Mo≡N] (9) and Ph₃SiOH, and the pyridine adduct of 10, [(pyridine)(Ph₃SiO)₃Mo≡N] (11), exhibit excellent catalytic activity in alkyne metathesis reactions of all kinds. Adduct 11 is sufficiently stable to be weighed in air and is therefore much easier to use than any of the established, structurally defined alkyne metathesis precatalysts known to date. This new system is compatible with a host of functional groups, including esters, amides, alkenes, carbamates, ethers, silyl ethers, sulfonates, thioethers, THP acetals, glycosides, ketones, enoates, thiophenes, pyridines, thiazoles, and nitro groups, and even accepts protected propargyl alcohols as substrates. It has been used for the preparation of key intermediates for bioactive natural products, such as gallicynoic acid I, homoepilachnene, epothilone A, cruentaren A, and a fully synthetic latrunculin analogue. However, 9 and 11 react with aldehydes and acid chlorides to give the corresponding nitrile derivatives.