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Synthesis 2020; 52(03): 433-440
DOI: 10.1055/s-0039-1690242
DOI: 10.1055/s-0039-1690242
paper
Synthesis of Nonsymmetric Iminophosphonamines by Kirsanov Condensation
This work was supported by the Russian Science Foundation (grant No. 19-13-00459). NMR studies, spectral characterization, elemental analysis were performed with the financial support from Ministry of Science and Higher Education of the Russian Federation using the equipment of Center for molecular composition studies of INEOS RAS.Further Information
Publication History
Received: 17 September 2019
Accepted after revision: 17 October 2019
Publication Date:
31 October 2019 (online)
Abstract
Despite the growing interest in iminophosphonamines R2P(NHR′)(NR′), nonsymmetric examples bearing different N,N′-substituents are quite rare and have been prepared exclusively by the Staudinger reaction. We report here the synthesis of a series of new iminophosphonamines Ph2P(NHR)(NR′) (R = Me, t-Bu, o-Tol; R′ = p-Tol, o-Tol, 2,6-Xyl, 2,6-Diip, p-Ts) showing that the Kirsanov condensation is a viable and simpler approach, although with some limitations. This method allows the synthesis to be accomplished in a one-pot manner via stepwise double amination of a trihalophosphorane and permits the introduction of at least one sterically bulky N-substituent. The second amination step is shown to be highly sensitive to: (a) the steric bulk of the amine, and (b) the acidity of the aminohalophosphonium intermediate.
Key words
Kirsanov condensation - nonsymmetric iminophosphonamines - steric effects - aminohalophosphoniumSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0039-1690242.
- Supporting Information
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