Synthesis 2019; 51(17): 3277-3286
DOI: 10.1055/s-0037-1611563
paper
© Georg Thieme Verlag Stuttgart · New York

Manganese(III)-Based Oxidative Cyclization of N-Aryl-2-oxocyclo­alkane-1-carboxamides: Synthesis of Spiroindolinones

Shintaro Katayama
,
Hiroshi Nishino*
This research was supported by the Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C) (No. 25410049 and 18K05109). We also acknowledge the Nissan Chemical Corporation for financial support.
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Publikationsverlauf

Received: 22. März 2019

Accepted after revision: 04. Mai 2019

Publikationsdatum:
24. Mai 2019 (online)


This manuscript is dedicated to the late Professor Shô Ito, Professor Emeritus of Tohoku University, Japan, who showed Hiroshi Nishino the way as a chemist.

Abstract

The Mn(III)-based oxidative cyclization of twenty-five N-aryl-2-oxocycloalkane-1-carboxamides is investigated. The reactions progress efficiently to give the desired spiro[cycloalkane-1,3′-indoline]-2,2′-diones in high to quantitative yields. The easy conversion of the carbonyl functional group of one of the indoline products, 1′-methylspiro[cyclo­hexane-1,3′-indoline]-2,2′-dione, is also demonstrated.

Supporting Information