Distortion, Tether, and Entropy Effects on Transannular Diels-Alder Cycloaddition Reactions of 10-18-Membered Rings
- Author(s): He, CQ
- Chen, TQ
- Patel, A
- Karabiyikoglu, S
- Merlic, CA
- Houk, KN
- et al.
Published Web Locationhttps://doi.org/10.1021/acs.joc.5b02288
© 2015 American Chemical Society. Density functional theory calculations were performed on a set of 13 transannular Diels-Alder (TADA) reactions with 10-18-membered rings. The results were compared with those for bimolecular and intramolecular Diels-Alder reactions in order to investigate the controlling factors of the high TADA reactivities. The effects of tether length, heteroatoms, and alkynyl dienophiles on reactivity were analyzed. We found a correlation between tether length and reactivity, specifically with 12-membered macrocycles undergoing cycloaddition most readily. Furthermore, modifying 12-membered macrocycles by heteroatom substitution and utilizing alkynyl dienophiles enhances the reaction rates up to 105-fold.
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