期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202111860
关键词
alkynes; axially chiral alkenes; C-H activation; directing group migration; rhodium
资金
- NSFC [22101167]
- SNNU
Axially chiral acyclic olefins were synthesized via C-H activation and olefin coupling with the assistance of a migratable directing group. Experimental results suggest different reaction pathways were utilized during the directing group migration process.
Axially chiral open-chain olefins represent an underexplored class of chiral platform. In this report, two classes of tetrasubstituted axially chiral acyclic olefins have been accessed in excellent enantioselectivity and regioselectivity via C-H activation of (hetero)arenes assisted by a migratable directing group en route to coupling with sterically hindered alkynes. The coupling of indoles bearing an N-aminocarbonyl directing group afforded C-N axially chiral acrylamides with the assistance of a racemic zinc carboxylate additive. DFT studies suggest a beta-nitrogen elimination-reinsertion pathway for the directing group migration. Meanwhile, the employment of N-phenoxycarboxamide delivered C-C axially chiral enamides via migration of the oxidizing directing group. Experiments suggest that in both cases the (hetero)arene substrate adopts a well-defined orientation during the C-H activation, which in turn determines the disposition of the alkyne in migratory insertion. Synthetic applications of representative chiral olefins are demonstrated.
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