On the stereochemical course of palladium-catalyzed cross-coupling of allylic silanolate salts with aromatic bromides.

On the stereochemical course of palladium-catalyzed cross-coupling of allylic silanolate salts with aromatic bromides.
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DOI:
10.1021/ja910804u
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发表时间:
2010-03-17
影响因子:
15
通讯作者:
Werner NS
Werner NS
中科院分区:
化学1区
文献类型:
--
作者:
Denmark SE;Werner NS

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The stereochemical course of palladium-catalyzed cross-coupling reactions of an enantioenriched, α-substituted, allylic silanolate salt with aromatic bromides has been investigated. The allylic silanolate salt was prepared in high geometrical (Z/E, 94:6) and high enantiomeric (94:6 er) purity by a copper-catalyzed SN2’ reaction of a resolved allylic carbamate. Eight different aromatic bromides underwent cross-coupling with excellent constitutional site selectivity (γ) and with excellent stereospecificity. Stereochemical correlation established that the transmetalation event proceeds through a syn SE’ mechanism which is interpreted in terms of an intramolecular delivery of the arylpalladium electrophile through a key intermediate that contains a discrete Si–O–Pd linkage.
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