Synthesis of 2-ethyl-2-methyl-2,3-dihydro-1H-indole, a new insecticide exhibiting juvenile hormone activity

Petrushkina, E. A.; Калинин, В. Н.; Ivanova, G. B.; Kheinman, V. A.

doi:10.1134/s107036320612022x

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…Kheinman and coworkers do postulate an aryl amino Claisen rearrangement as part of a thermal synthesis of 2-ethyl-2-methyl-2,3dihydro-1H-indole, an insecticide, where their allylic amine starting material is synthesized via the hydroamination of isoprene with aniline. 40 Herein, we report the use of a new 3-iminophosphine catalyst, [(3IP tBu )Pd(allyl)]OTf, for the hydroamination of 3-methyl-1,2butadiene at room temperature, generating the branched allylic amine product exclusively. Hydroamination of 3-methyl-1,2-butadiene was also coupled to an aryl amino Claisen rearrangement in a one-pot, two-step synthesis of 2-(3-methyl-2-butenyl)-anilines.…”

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“…Both N-(1,1-dimethyl-2-propenyl)-anilines and 2-(3-methyl-2-butenyl)-anilines are desirable compounds because of their applicability in the synthesis of heterocycles that are common in many natural products and pharmaceuticals. 28,40,41 Our ongoing investigations with this catalyst system are aimed at expansion of the substrate scope, with specific interest in utilization of different allenes and other unsaturated carbon frameworks. Additionally, we are pursuing modifications to the catalyst structure in an effort to make this catalysis more amenable to greener solvents, such as alcohols.…”

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Hydroamination of 1,1-dimethylallene with primary aryl amines under mild conditions: An atom-economical route to N-(1,1-dimethyl-2-propenyl)-anilines

Beck

Schmidt

2012

RSC Adv.

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Hydroamination of 1,1-dimethylallene with primary aryl amines under mild conditions: An atom-economical route to N-(1,1-dimethyl-2-propenyl)-anilines

Beck

Schmidt

2012

RSC Adv.

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“…Functionalized allylamines are a class of molecules that constitute a useful synthetic target due to their importance as intermediates in the synthesis of indoles [1][2][3][4][5] and heterocycles, [6][7][8][9][10][11][12][13][14][15] as well as their prevalence in pharmaceuticals, including drugs such as cinnarizine, 16 unarizine, 17 naine, 18 terbinane, 19,20 and zimelidine (Fig. 1).…”

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confidence: 99%

Palladium catalyzed intermolecular hydroamination of 1-substituted allenes: an atom-economical method for the synthesis of N-allylamines

2013

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Hydroamination of Alkenes

Reznichenko

Hultzsch

2015

Organic Reactions

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The addition of an amine NH‐functionality to alkenes (including vinyl arenes, conjugated dienes, allenes or ring‐strained alkenes), the so‐called hydroamination, represents a simple and highly atom‐economical approach for the synthesis of nitrogen‐containing products. A large variety of catalyst systems are available, ranging from alkali, alkaline earth, rare earth, Group 4 and Group 5 metals, to late transition metal catalysts, and, less prominent, Brønsted and Lewis acid‐based catalyst systems. The mode of operation of these catalyst systems can vary significantly and the different reaction mechanisms and the scope and limitations are discussed. While intramolecular hydroamination reactions can be readily achieved with a large number of catalyst systems, significantly fewer examples for the more challenging intermolecular hydroamination are known, especially for unactivated alkenes. The stereoselective hydroamination has also received significant attention due to the importance of chiral nitrogen‐containing molecules in pharmaceutical industry. A variety of highly selective chiral catalyst systems have been developed for intramolecular hydroaminations, while examples of intermolecular asymmetric hydroaminations are scarce. Hydroamination in the context of this review article is defined as the addition of HNR 2 across a non‐activated, unsaturated carbon‐carbon multiple bond. This review focuses on the hydroamination reaction of simple, non‐activated alkenes. The addition of amines to slightly activated alkenes, such as vinyl arenes, 1,3‐dienes, strained alkenes (norbornene derivatives, methylenecyclopropenes) and allenes is closely related and is covered as well. However, hydroamination reactions of alkynes and Aza‐Michael reactions involving the addition of an N‐H fragment across the conjugated or otherwise activated double bond of a Michael acceptor are not covered. The scope of amine types includes ammonia, primary and secondary aliphatic and aromatic amines, azoles, and hydrazines. N ‐Protected amines, such as ureas, carboxamides, and sulfonamides are covered as well, as they are important substrates for metal‐free and late transition metal‐based catalysts. The literature through January 2011 will be covered with two selected references from 2012 (comprising Table 3D). A supplemental reference list is provided for reports appearing February 2011 through April 2015. The chapter is organized by the nature of the carbon unsaturation to which the amine is added. Ranging from less reactive substrates such as ethylene and unactivated alkenes, to slightly activated substrates, such as vinyl arenes, and more activated substrates, including conjugated dienes, allenes and strained alkenes. Enantioselective hydroamination reactions, an area that has seen significant progress over the past decade, are discussed next. Finally, tandem hydroamination/carbocyclization reactions of aminodialkenes provide rapid access to complex alkaloidal skeletons. The tables at the end of the chapter are separated into five main sections: achiral intermolecular hydroamination, achiral intramolecular hydroamination, enantioselective intermolecular hydroamination, enantioselective intramolecular hydroamination, and tandem hydroamination/carbocyclization. Within the first four sections the tables are further divided into subsections based on the participating alkene, i.e. alkenes, vinyl arenes, dienes, allenes, and strained alkenes.

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Synthesis of 2-ethyl-2-methyl-2,3-dihydro-1H-indole, a new insecticide exhibiting juvenile hormone activity

Cited by 5 publications

References 18 publications

Hydroamination of 1,1-dimethylallene with primary aryl amines under mild conditions: An atom-economical route to N-(1,1-dimethyl-2-propenyl)-anilines

Hydroamination of 1,1-dimethylallene with primary aryl amines under mild conditions: An atom-economical route to N-(1,1-dimethyl-2-propenyl)-anilines

Palladium catalyzed intermolecular hydroamination of 1-substituted allenes: an atom-economical method for the synthesis of N-allylamines

Hydroamination of Alkenes

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