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Synlett 2018; 29(07): 933-937
DOI: 10.1055/s-0036-1591919
letter
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Symmetrical N-Aryl-C-phosphonoacetamidines

Elena B. Erkhitueva
a   Saint Petersburg State University, Universitetskaya nab. 7–9, St. Petersburg 199034, Russian Federation
,
Taras L. Panikorovskii
a   Saint Petersburg State University, Universitetskaya nab. 7–9, St. Petersburg 199034, Russian Federation
,
Nataly I. Svintsitskaya*
b   Saint Petersburg State Institute of Technology (Technical University), Moskovskii pr. 26, St. Petersburg 190013, Russian Federation   eMail: nsvincickaya@mail.ru
,
Rostislav Е. Trifonov
a   Saint Petersburg State University, Universitetskaya nab. 7–9, St. Petersburg 199034, Russian Federation
b   Saint Petersburg State Institute of Technology (Technical University), Moskovskii pr. 26, St. Petersburg 190013, Russian Federation   eMail: nsvincickaya@mail.ru
,
Аlbina V. Dogadina
b   Saint Petersburg State Institute of Technology (Technical University), Moskovskii pr. 26, St. Petersburg 190013, Russian Federation   eMail: nsvincickaya@mail.ru
› InstitutsangabenThis work was financially supported by the Russian Foundation for Basic Research (Grant no. 16-03-00474).
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Publikationsverlauf

Received: 05. Dezember 2017

Accepted after revision: 04. Januar 2018

Publikationsdatum:
06. Februar 2018 (online)

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Abstract

An efficient synthesis of a series of novel symmetrical N-aryl-C-phosphonoacetamidines through reaction of diisopropyl (chloroethynyl)phosphonate with primary aryl amines was developed. This procedure tolerates a wide range of functional groups and has a good atom economy. The (E)-isomer was the major product that crystallized preferentially over the (Z)-isomer.

Key words

aryl amidines - carbamimidoylphosphonoacetic acid - aryl amines - phosphonoacetamidines

Supporting Information

    Supporting information for this article is available online at https://doi.org/10.1055/s-0036-1591919.
  • Supporting Information
 

  • References and Notes

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  • 26 N-Aryl-C-phosphonoacetamidines 3a–s; General Procedure The appropriate aniline 2a–s (2 mmol) was added to a mixture of diisopropyl (chloroethynyl)phosphonate (1; 1 mmol) and K2CO3 (1 mmol) in anhyd acetonitrile (10 mL) at r.t., and the mixture was stirred vigorously under reflux for 5–25 h. When the reaction was complete, the mixture was filtered and concentrated, and the residue was crystallized from hexane. Diisopropyl {(2E)-2-[(4-Fluorophenyl)amino]-2-[(4-fluorophenyl)imino]ethyl}phosphonate (3e) White needle crystals; yield: 332 mg (81%); mp 104–106 °C. IR (KBr): 995.27 (P–O–C), 1226.73 (P=O), 1500.62 (C=N) cm–1. 1H NMR (400.13 MHz, DMSO-d 6): δ = 1.16 (d, 3 J HH = 6.1 Hz, 6 H, CH3), 1.21 (d, 3 J HH = 6.2 Hz, 6 H, CH3), 2.92 (d, 2 J HP = 21.8 Hz, 2 H, CH2P), 4.53 (m, 3 J HH = 6.1 Hz, 3 J HP = 12.4 Hz, 1 H, CHOP), 4.54 (m, 3 J HH = 6.1 Hz, 3 J HP = 14.0 Hz, 1 H, CHOP), 6.82 [m, 3 J HH = 8.8 Hz, 1 H, o-CH, Ar(NH)], 6.83 [m, 3 J HH = 8.8 Hz, 1 H, o-CH, Ar(NH)], 7.09 (m, 3 J HH = 9.1 Hz, 4 H, m-CH, Ar), 7.73 [m, 3 J HH = 9.2 Hz, 1 H, o-CH, Ar(N=)], 7.75 [m, 3 J HH = 9.2 Hz, 1 H, o-CH, Ar(N=)], 8.66 (s, 1 H, NH). 13C NMR (100.61 MHz, DMSO-d 6): δ = 23.97 (d, 3 J CP = 4.4 Hz, CH3), 24.11 (d, 3 J CP = 4.4 Hz, CH3), 30.25 (d, 1 J CP = 133.5 Hz, CH2P), 70.98 [d, 2 J CP = 6.6 Hz, (OCH)2P], 115.38 [d, 2 J CF = 21.3 Hz, m-CH, Ar(NH)], 115.59 [d, 2 J CF = 22.0 Hz, m-CH, Ar(N=)], 121.02 [d, 3 J CF = 7.3 Hz, o-CH, Ar(NH)], 123.50 [d, 3 J CF = 8.0 Hz, o-CH, Ar(N=)], 137.57 (d, 4 J CF = 1.5 Hz, C-ipso-N=), 146.67 (d, 4 J CF = 1.5 Hz, C-ipso-NH), 148.09 (d, CH2 C, 2 J CP = 7.3 Hz), 157.62 [d, 1 J CF = 239.1 Hz, CF, Ar(NH)], 158.40 [d, 1 J CF = 237.6 Hz, CF, Ar(N=)]. 31P NMR (161.98 MHz, DMSO-d 6): δ = 20.63. 19F NMR (376.50 MHz, DMSO-d 6): δ = –122.72 [F, Ar(NH)], –121.19 [F, Ar(N=)]. ESI-HRMS: m/z [M + H]+ calcd for C20H26F2N2O3P: 411.1660; found: 411.1644.
  • 27 CCDC 1505945 and CCDC 1518068 contain the supplementary crystallographic data for compounds 3k and 3l, respectively. The data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/getstructures.