Enantioselective organocatalytic formal [3+2]-cycloaddition of isatin-derived ketimines with benzylidenemalononitriles and benzylidineindanones

Conor Duffy, William E Roe, Aislinn M. Harkin, Ryan McNamee, Peter Clarke Knipe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The biological and medicinal importance of oxindole-derived spirocycles is now well-established, and has inspired the development of numerous creative synthetic strategies. Here we report an efficient formal [3+2]-cycloaddition of isatin-derived N-trifluoroethyl ketimines with a series of cinnamonitrile and benzylidineindandione dipolarophiles catalysed by a cinchona-derived thiourea catalyst. The reaction affords a series of functionalized spiro-pyrrolidinoxindole products with up to four contiguous stereocentres in excellent yields, ee and d.r. (up to 98% yield, 97% ee, and 49:1 d.r.). These products share a common core scaffold with compounds previously found to have anti-tumour, anti-microbial and anti-inflammatory activities.
Original languageEnglish
JournalNew journal of chemistry
Early online date03 Nov 2021
DOIs
Publication statusEarly online date - 03 Nov 2021

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