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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
Highly selective alpha-acylvinyl anion additions to imines
Troy E Reynolds1, Michael S Binkley, Karl A Scheidt
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
This study shows alpha-hydroxypropargylsilanes rearrange to lithium allenolates. These react with imines to create valuable beta-substituted aza-Morita-Baylis-Hillman products with high selectivity.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Alpha-hydroxypropargylsilanes are versatile synthetic precursors.
- Developing efficient methods for creating complex organic molecules is crucial in synthetic chemistry.
Purpose of the Study:
- To investigate the rearrangement of alpha-hydroxypropargylsilanes.
- To explore the selective addition of the resulting intermediates to N-tert-butanesulfinyl imines.
- To synthesize beta-substituted aza-Morita-Baylis-Hillman (aza-MBH) type products.
Main Methods:
- Rearrangement of alpha-hydroxypropargylsilanes to lithium allenolates.
- Nucleophilic addition of lithium allenolates to N-tert-butanesulfinyl imines.
- Analysis of reaction products for yield, diastereoselectivity, and regioselectivity.
Main Results:
- Successful rearrangement of alpha-hydroxypropargylsilanes to reactive lithium allenolates.
- Highly selective addition of allenolates to N-tert-butanesulfinyl imines.
- Generation of beta-substituted aza-MBH-type products in high yields.
- Good to excellent diastereoselectivity and regioselectivity (8-20:1 major/minor ratio) favoring the Z-alkene isomer.
Conclusions:
- The described method provides an efficient route to beta-substituted aza-MBH products.
- The reaction demonstrates broad substrate scope for both silanes and imines.
- The high stereoselectivity offers precise control in synthesizing complex organic molecules.
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