Volume 57, Issue 51 pp. 16847-16851
Communication

Nitromethane as a Carbanion Source for Domino Benzoannulation with Ynones: One-Pot Synthesis of Polyfunctional Naphthalenes and a Total Synthesis of Macarpine

Dr. Shweta Singh

Dr. Shweta Singh

Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad-, 500007 India

These authors contributed equally to this work.

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Dr. Ramesh Samineni

Dr. Ramesh Samineni

Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad-, 500007 India

Present address: Department of Chemistry, SRMIST, Kattankulathur, Chennai-, 603203 India

These authors contributed equally to this work.

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Dr. Srihari Pabbaraja

Corresponding Author

Dr. Srihari Pabbaraja

Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad-, 500007 India

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Prof. Goverdhan Mehta

Corresponding Author

Prof. Goverdhan Mehta

School of Chemistry, University of Hyderabad, Hyderabad-, 500046 India

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First published: 15 October 2018
Citations: 52

Graphical Abstract

A one-pot, transition-metal-free, domino Michael/SNAr process was devised for the regioselective synthesis of polyfunctional naphthalenes by employing nitromethane and ortho-haloaryl ynones. Nitromethane was utilized as a one-carbon carbanion source that is incorporated into a variety of ynones, ending up as an aromatic nitro substituent. This reaction was used in the total synthesis of the polycyclic alkaloid macarpine.

Abstract

A one-pot, transition-metal-free, domino Michael/SNAr protocol of general applicability has been devised for the regioselective synthesis of polyfunctional naphthalenes by employing nitromethane and ortho-haloaryl ynones. Utilization of nitromethane as a one carbon carbanion source that is incorporated into a variety of ynones, ends up as an aromatic nitro substituent. The application of this domino process towards a total synthesis of the polycyclic alkaloid macarpine demonstrate for the efficacy of this methodology. The conceptually simple approach to affect regioselective, multifunctional benzoannulation of ynones displays wide substrate scope and functional-group tolerance and has been implemented with substituted nitromethanes, as well as with alicyclic o-haloynones.

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