Approaches toward Atropisomerically Stable and Conformationally Pure Diarylamines.
Approaches toward Atropisomerically Stable and Conformationally Pure Diarylamines.
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DOI:
10.1021/acs.joc.2c00451
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发表时间:
2022-05-20
影响因子:
3.6
通讯作者:
Gustafson, Jeffrey L.
中科院分区:
文献类型:
--
作者:
Vaidya, Sagar D.;Heydari, Beeta S.;Toenjes, Sean T.;Gustafson, Jeffrey L.
Diarylamines possess two potentially atropisomeric C-N axes, however there are few examples of atropisomerically stable diarylamines in the literature as the contiguous axes can allow for low energy racemization pathways via concerted bond rotations. Herein we describe highly atropisomerically stable diarylamines that possess barriers to racemization of 30-36 kcal/mol, corresponding to half-lives to racemization on the decade to century time scale at room temperature. Investigation of the factors that led to the high stereochemical stability suggests that increased conjugation of the aniline lone pair of electrons into a more electron deficient aryl ring, coupled with intramolecular hydrogen bonding, locked the corresponding axis into a defined planar conformation, disfavoring the lower energy racemization pathways.
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影响因子:
15
作者:
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通讯作者:
STERNHELL, S
影响因子:
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Toenjes, Sean T.;Gustafson, Jeffrey L.
通讯作者:
Gustafson, Jeffrey L.