Journal of Organic Chemistry p. 11541 - 11551 (2018)
Update date:2022-08-17
Topics:
Takeda, Takuya
Harada, Shinji
Okabe, Akito
Nishida, Atsushi
A new approach for the synthesis of highly functionalized tetrahydrocyclohepta[b]indoles through [5 + 2] cycloaddition was developed. Two carbon-carbon bonds were formed by the simple addition of an indium catalyst, which acted as both a δ-Lewis acid and σ-Lewis acid to activate the alkyne and unsaturated ester, respectively. The reaction could be applied to various substrates and proceeded regio- and diastereoselectively in all cases.
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