Origin of High Diastereoselectivity in Reactions of Seven-Membered-Ring Enolates.
Origin of High Diastereoselectivity in Reactions of Seven-Membered-Ring Enolates.
复制标题
七元环烯醇酯反应中高非对映选择性的来源。
DOI:
10.1002/anie.202114183
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发表时间:
2022-03-28
期刊:
影响因子:
--
通讯作者:
Woerpel KA
中科院分区:
文献类型:
--
作者:
Lavinda O;Witt CH;Woerpel KA
Unlike many reactions of their six-membered-ring counterparts, the reactions of chiral seven-membered-ring enolates are highly diastereoselective. Diastereoselectivity was observed for a range of substrates, including lactam, lactone, and cyclic ketone derivatives. The stereoselectivity arises from torsional and steric interactions that develop when electrophiles approach the diastereotopic π-faces of the enolates, which are distinguished by subtle differences in the orientation of nearby atoms of the ring. The diastereoselective reactions of chiral seven-membered-ring enolates have been systematically investigated. Diastereoselectivity was found to be general for ε-lactams, ε-lactones, and cycloheptanones with various substituent patterns. Computational investigations provided insight into the origin of diastereoselectivity. A model for predicting the stereochemistry of seven-membered-ring enolate alkylations is proposed.
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