Synthesis of Linear (Z)‐α,β‐Unsaturated Esters by Catalytic Cross‐Metathesis. The Influence of Acetonitrile |
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Authors: | Elsie C Yu Brett M Johnson Erik M Townsend Prof Richard R Schrock Prof Amir H Hoveyda |
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Institution: | 1. Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, USA;2. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA |
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Abstract: | Kinetically controlled catalytic cross‐metathesis reactions that generate (Z)‐α,β‐unsaturated esters selectively are disclosed. A key finding is that the presence of acetonitrile obviates the need for using excess amounts of a more valuable terminal alkene substrates. On the basis of X‐ray structure and spectroscopic investigations a rationale for the positive impact of acetonitrile is provided. Transformations leading to various E,Z‐dienoates are highly Z‐selective as well. Utility is highlighted by application to stereoselective synthesis of the C1–C12 fragment of biologically active natural product (?)‐laulimalide. |
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Keywords: | alkenes catalysis cross-metathesis enoates molybdenum |
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