100 Ye et al.
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6-(Diethoxy-phosphoryl)-3,7a-bis(diisopropoxy-
phosphoryl)-7,7a-dihydro-6H-isoxazolo[2,3-d][1,2,
4]oxadiazole-7-carboxylic Acid Methyl Ester (8f).
The compound was obtained in 78.8% yield. Ele-
mental analysis found (calcd): C 47.79 (47.71), H 7.0
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1
(6.97), N 4.28 (4.31). H NMR: 5.31–5.45 (dd, 1H),
4.77 (m, 4H), 4.13–4.20 (m, 5H), 3.75–3.77 (s, 3H),
1.27–1.37 (m, 30H); 31P NMR: 0.03 (αP), −3.27 (βP),
17.7 (γP).
Isolated yields of 8 are based on substituted
vinylphosphonate.
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Heteroatom Chemistry DOI 10.1002/hc