Synthesis of New Heterocyclic Mono- and Bisorganophosphorus Acids and Their Derivatives with 1,2-Phenylene Fragments
3
3
125.3 (m, С2, С5, С6), 145.20 (t, С3, JPС = 5.6 Hz),
133.63 (s, С4), 129.40 (s, С7), 169.04 (s, С8), –0.23 (s,
2 Ме3Si), and –0.09 (s, 2 Ме3Si). 31Р NMR, δ, ppm:
–8.91 (s). Found: С 41.03; Н 6.84. С20Н40О8P2Si4.
Calcd.: С 41.22; Н 6.92.
O
4 MeOH
2
O
- 4 Me3SiOMe
(HO)
2P
P(OH)2
Trimethylsilyl 2-{(diethoxyphosphoryl)[(diethoxy-
phosphoryl)oxy]methyl}benzoate (3). A solution of
12 g of diethyl trimethylsilyl phosphite and 3.8 g
of diethyl phosphite in 20 mL of methylene chloride
was added to a mixture of 3.7 g of phthalic anhy-
dride and 15 mL of methylene chloride. After the
completion of the exothermic reaction, the solvent
was distilled off and the residue was distilled. Yield
O
O
9
O
O
S
2 MeOH
6
O
- 2 Me3SiOMe
1
11 g (89%), bp 187◦C (1 mm Hg). Н NMR, δ, ppm:
P(OH)2
6.79 (dd, С1Н, 2JPH = 14.8 Hz, 3JРH = 10.8 Hz), 6.9–
7.6 (m, С6Н4), 3.4–3.7 (m, 4 СН2ОР), 0.7–0.9 (m, 4
СН3), –0.04 (s, Ме3Si). 13С NMR, δ, ppm: 69.70 (dd,
O
10
1
2
С1, JРС = 166.9 Hz, JРС = 5.6 Hz), 129.41 (d, С2,
2JPС = 5.6 Hz), 135.61(s, С3), 131.72 (s, С4), 127.81 (s,
С5, С6), and 127.97 (s, С5, С6), 130.80 (s, С7), 166.11
(s, С8), 62.5–63.7 (m, 4 СН2ОР), 15.5–16.1 (m, 4 Ме),
–0.74 (s, Ме3Si). 31Р NMR, δ, ppm: 16.45 (d. Р1, 3JРР
SCHEME 4 Synthesis of acids 9 and 10.
4
7
4
C8(O)
3
SO3
3
5
5
P2(O)OC1HP1(O)
2
2
3
= 33.4 Hz), –1.49 (d, Р2, JРР = 33.4 Hz). Found: С
C1P(O)
6
C1P(O)
6
7
45.82; Н 6.78. С19Н34О9P2Si. Calcd.: С 45.96; Н 6.90.
The fraction boiling at 110–130◦C (1 mm Hg) con-
tains phosphonate 4, 1Н NMR, δ, ppm: 5.44 (d, С1Н,
D
C
B
1
2JPH = 8.3 Гц), 13С NMR, δ, ppm: 75.10 (d, С1, JРС
FIGURE 1 Fragments B–D.
= 163.4 Гц), 31Р NMR, δ, ppm: 13.48 (s), and diethyl
trimethylsilyl phosphate (δР –9.32 ppm, (s)).
The phosphonates 6 and 8 were obtained simi-
larly.
argon in anhydrous solvents. Starting trimethylsilyl
esters of phosphorous acid were prepared according
to the procedures described in [17].
Bis(trimethylsilyl) (1,1-dioxido-3Н-2,1-benzoxa-
thiol-3-yl)phosphonate (6). Yield 52%, bp 142◦C
Tetra(trimethylsilyl) (3-oxo-1,3-dihydro-2-benzo-
furan-1,1-diyl)bisphosphonate (2). A mixture of
16.4 g of tris(trimethylsilyl) phosphite, 5.7 g of
bis(trimethylsilyl) phosphite, 3.7 g of phthalic anhy-
dride, and 2 mL of trimethylchlorosilane in 15 mL
of methylene chloride was stirred for 1 h. Then the
solvent was distilled off. In the NMR spectrum of
the mixture, the signals of the phosphonate 1 were
observed. 1Н NMR, δ, ppm: 7.25–7.50 (m, С6Н4),
–0.05 (s, Ме3SiОС), –0.31 (s, Ме3SiОР), and –0.38
2
(1 mm Hg). 1Н NMR, δ, ppm: 5.53 (d, С1Н, JPH
= 8.2 Hz), 7.3–7.5 (m, С6Н4), –0.01 (m, Ме3Si). 13С
NMR, δ, ppm: 77.85 (d, С1, 1JРС = 171.2 Hz), 130.91
2
3
(d, С2, JPС = 5.3 Hz), 135.61 (d, С3, JPС = 4 Hz),
133.56 (s, С4), 127.30 (s, С5, С6), and 125.04 (s, С5,
С6), 130.34 (s, С7), 0.23 (s, Ме3Si). 31Р NMR, δ, ppm:
–6.80 (s). Found: С 39.43; Н 5.72. С13Н23О6PSSi2.
Calcd.: С 39.58; 5.88. The fraction boiling at 90–
110◦C (1 mm Hg) contains tris(trimethylsilyl) phos-
phate (δР –26.01 ppm). Before the distillation, the
(s, Ме3SiОР). 13С NMR, δ, ppm: 101.86 (d, С1, JPС
1
= 227.5 Hz), 126.32 (s, С2), 145.98 (d, С3, JPС
=
3
1
reaction mixture contained compound 5, Н NMR,
9.5 Hz), 133.66 (s, С4), 124.26 (s, С5, С6), and 124.29
(s, С5, С6), 130.35 (s, С7), 166.60 (s, С8), 0.85 (s,
Ме3SiОС), 0.54 (s, Ме3SiОР), and 0.14 (s, Ме3SiОР).
31Р NMR, δ, ppm: –6.45 (s). Then trimethylchlorosi-
lane (2 mL) was added to the reaction mixture. The
mixture was kept at 20◦C for 2 weeks and then dis-
tilled to obtain 12.7 g of bisphosphonate 2. Yield
87%, boiling point (bp) 172◦C (1 mm Hg), melting
point (mp) 52◦C. 1Н NMR, δ, ppm: 7.25–7.55 (m,
δ, ppm: 6.15 (dd, С1Н, 2JPH = 14.8 Гц, 3JРH = 10 Hz),
13С NMR, δ, ppm: 69.90 (dd, С1, JРС = 179.5 Гц,
1
3JРС = 6.6 Гц). 31Р NMR, δ, ppm: –1.76 (d, Р1, 3JРР
=
41.6 Hz), –19.66 (d, Р2, 3JРР = 41.6 Hz).
Diethyl
(1,1-dioxido-3H-2,1-benzoxathiol-3-yl)
phosphonate (8). Yield 47%, bp 133◦C (1 mm Hg). 1Н
NMR, δ, ppm: 5.79 (d, С1Н, JPH = 8.1 Hz), 7.4–7.9
2
(m, С6Н4), 3.7–3.9 (m, 2 СН2О), 1.1–1.3 (m, 2 СН3).
13С NMR, δ, ppm: 77.15 (d, С1, JPС = 165.3 Hz),
1
С6Н4), –0.23 (s, 2 Ме3Si), and –0.09 (s, 2 Ме3Si). 13
С
130.78 (d, С2, JPС = 5.2 Hz), 132.30 (d, С3, JPС
=
2
3
NMR, δ, ppm: 83.14 (t, С1, JPС = 162.5 Hz), 124.8–
1
4.3 Hz), 133.95 (s, С4), 121.63 (s, С5, С6), and 124.79
Heteroatom Chemistry DOI 10.1002/hc