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34247161902
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Takahashi, S.; Yamada, Y.; Ueda, Y.; Katayama, Y.; Shimada, Y.; Watanabe, K. Patent JP61,072,762.
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34247160089
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Nanba, H.; Yajima, K.; Takano, M.; Yamada, Y.; Ikenaka, Y.; Takahashi, S. Patent WO96/20275.
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34247154943
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note
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Multigram syntheses of (l)-3 and (d)-2. Compound 3 (267 g, 1.14 mol) was added to a 3.2% aq NaCl solution (1405 g), and the resultant mixture was adjusted to pH 6.5 with aq NaOH solution. Then, immobilized hydantoinase (total 87 g, wet weight) and manganese sulfate pentahydrate (0.44 g) were added to the mixture, and the reaction was performed by stirring at 40 °C for 41.5 h. During the reaction, the pH was kept at 6.5 using 10% aqueous sulfuric acid solution. After the reaction, a mixture of the precipitate and the immobilized hydantoinase was filtered off and washed with water (300 g). (d)-2 was obtained in the mixture (132.6 g, yield 43.9%, optical purity 97.8% ee). The filtrate was washed with ethyl acetate (300 g) twice, and cooled to 20 °C. Then the filtrate was adjusted to pH 3 with concd HCl (59 g) and stirred for 30 min. The precipitated solid was filtered off, washed with water, and (l)-3 was obtained as white crystals. (132.6 g, yield 49.6%) The chemical purity was 97.3 area% by HPLC (column, COSMOSIL 5C8-MS (produced by Nacalai Tesque Inc), mobile phase, potassium dihydrogen phosphate-phosphoric acid solution (pH 2.0)/acetonitrile = 80/20, flow rate, 1.0 ml/min, detection wavelength, 210 nm, column temperature, 40 °C). The optical purity was 99.5% ee by HPLC (column, CHIRALPAK AS (produced by Daicel Chemical Industries, Ltd), mobile phase, hexane/2-propanol/trifluoroacetic acid = 80/20/0.1, flow rate, 0.5 ml/min, detection wavelength, 210 nm, column temperature, 30 °C). The yield and optical purity of (d)-2 were determined by HPLC (For yield: column, COSMOSIL 5C18-AR (produced by Nacalai Tesque Inc), mobile phase, potassium dihydrogen phosphate-phosphoric acid solution (pH 2.0)/acetonitrile = 70/30, flow rate, 1.0 ml/min, detection wavelength, 210 nm, column temperature, 40 °C), For optical purity: column, CHIRALPAK AS (produced by Daicel Chemical Industries, Ltd), mobile phase, hexane/2-propanol/trifluoroacetic acid = 85/15/0.1, flow rate, 1.0 ml/min, detection wavelength, 210 nm, column temperature, 30 °C.
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0023907011
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Yajima H., Fujii N., Funakoshi S., Watanabe T., Murayama E., and Otaka A. Tetrahedron 44 (1988) 805
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(1988)
Tetrahedron
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, pp. 805
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Yajima, H.1
Fujii, N.2
Funakoshi, S.3
Watanabe, T.4
Murayama, E.5
Otaka, A.6
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28
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0023386969
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Fujii N., Otaka A., Ikemura O., Hatano M., Okamachi A., Funakoshi S., Sakurai M., Shioiri T., and Yajima H. Chem. Pharm. Bull. 35 (1987) 3447
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Chem. Pharm. Bull.
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Fujii, N.1
Otaka, A.2
Ikemura, O.3
Hatano, M.4
Okamachi, A.5
Funakoshi, S.6
Sakurai, M.7
Shioiri, T.8
Yajima, H.9
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29
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0023551357
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Fujii N., Otaka A., Sugiyama N., Hatano M., and Yajima H. Chem. Pharm. Bull. 35 (1987) 3880
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(1987)
Chem. Pharm. Bull.
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Fujii, N.1
Otaka, A.2
Sugiyama, N.3
Hatano, M.4
Yajima, H.5
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30
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37049082963
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Fujii N., Otaka A., Funakoshi S., Bessho K., and Yajima H. J. Chem. Soc., Chem. Commun. 3 (1987) 163
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(1987)
J. Chem. Soc., Chem. Commun.
, vol.3
, pp. 163
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Fujii, N.1
Otaka, A.2
Funakoshi, S.3
Bessho, K.4
Yajima, H.5
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37049088646
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Akaji K., Yoshida M., Tatsumi T., Kimura T., Fujiwara Y., and Kiso Y. J. Chem. Soc., Chem. Commun. 4 (1990) 288
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J. Chem. Soc., Chem. Commun.
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Akaji, K.1
Yoshida, M.2
Tatsumi, T.3
Kimura, T.4
Fujiwara, Y.5
Kiso, Y.6
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32
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0033234609
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Almstead et al. reported that tert-butyl group of thio-bisphosphonate was cleaved simply by heating with concd HCl.
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Almstead et al. reported that tert-butyl group of thio-bisphosphonate was cleaved simply by heating with concd HCl. Almstead N.G., Dansereau S.M., Francis M.D., Snider C.M., Ebetino F.H. Phosphorus, Sulfur and Silicon 144-146 (1999) 325
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Phosphorus, Sulfur and Silicon
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Almstead, N.G.1
Dansereau, S.M.2
Francis, M.D.3
Snider, C.M.4
Ebetino, F.H.5
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34247160962
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note
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1H NMR analysis of the residue, it was confirmed that the desired compound (106 mg, yield 60%) had been produced. The HPLC analysis (column, CHIRALCEL OD-RH (produced by Daicel Chemical Industries, Ltd), mobile phase, potassium dihydrogen phosphate-phosphoric acid solution (pH 2.0)/acetonitrile = 6/4, flow rate, 1.0 ml/min, detection wavelength, 210 nm, column temperature, 30 °C, retention time, 19.15 min (d), 22.92 min (l)) of the compound showed an optical purity of 99.6% ee.
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