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We have also investigated chemoenzymatic approaches for the preparation of 4; see: (a) Goswami, A.; Totleben, M. J.; Singh, A. K.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 3167. (b) Goswami, A.; Mirfakhrae, K. D.; Totleben, M. J.; Swaminathan, S.; Patel, R. N. J. Ind. Microbiol. Biotechnol. 2001, 26, 259. (c) Goswami, A.; Mirfakhrae, K. D.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 4239.
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0034896762
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We have also investigated chemoenzymatic approaches for the preparation of 4; see: (a) Goswami, A.; Totleben, M. J.; Singh, A. K.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 3167. (b) Goswami, A.; Mirfakhrae, K. D.; Totleben, M. J.; Swaminathan, S.; Patel, R. N. J. Ind. Microbiol. Biotechnol. 2001, 26, 259. (c) Goswami, A.; Mirfakhrae, K. D.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 4239.
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Patel, R.N.5
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35
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0033407110
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We have also investigated chemoenzymatic approaches for the preparation of 4; see: (a) Goswami, A.; Totleben, M. J.; Singh, A. K.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 3167. (b) Goswami, A.; Mirfakhrae, K. D.; Totleben, M. J.; Swaminathan, S.; Patel, R. N. J. Ind. Microbiol. Biotechnol. 2001, 26, 259. (c) Goswami, A.; Mirfakhrae, K. D.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 4239.
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36
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0002094569
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(a) Brougham, P.; Cooper, M. S.; Cummerson, D. A.; Heaney, H.; Thompson, N. Synthesis 1987, 1015.
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Brougham, P.1
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39
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0348101354
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(d) Shanley, E. S. Chem. Eng. News 1978, 56(29), 43. m-CPBA was described as a safe alternate to Davis reagent in a large-scale synthesis of a drug intermediate. See: Stappers, F.; Broeckx, R.; Leurs, S.; Bergh, L. V. D.; Agten, J.; Lambrechts, A.; Heuvel, D. V. D.; Smaele, D. D. Org. Process Res. Dev. 2002, 6, 618.
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Shanley, E.S.1
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0347471370
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(d) Shanley, E. S. Chem. Eng. News 1978, 56(29), 43. m-CPBA was described as a safe alternate to Davis reagent in a large-scale synthesis of a drug intermediate. See: Stappers, F.; Broeckx, R.; Leurs, S.; Bergh, L. V. D.; Agten, J.; Lambrechts, A.; Heuvel, D. V. D.; Smaele, D. D. Org. Process Res. Dev. 2002, 6, 618.
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Stappers, F.1
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Lambrechts, A.6
Heuvel, D.V.D.7
Smaele, D.D.8
-
42
-
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0642363739
-
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Dichloromethane is often the preferred solvent for epoxidations with manganese-salen complexes. Acetonitrile as solvent for the reaction has also been described. See Gurjar, M. K.; Sarma, B. V. N. B. S.; Rama Rao, A. V. Ind. J. Chem. 1997, 36B, 213.
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Ind. J. Chem.
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Gurjar, M.K.1
Sarma, B.V.N.B.S.2
Rama Rao, A.V.3
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0346210183
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Byun, H.-S.; Kumar, E. R.; Bittman, R. J. Org. Chem. 1994, 59, 263.
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Byun, H.-S.1
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49
-
-
0348101338
-
-
note
-
The olefin 2, available as a solution in t-BuOH containing ∼2% of MTBE was used. If MTBE is present in greater than 10% v/v, the reaction stalls.
-
-
-
-
50
-
-
0346210198
-
-
note
-
The diol 5 is more soluble in EtOAc, but BuOAc affords a superior azeotropic removal of water during the subsequent concentration prior to crystallization. Lab experiments have demonstrated that when the water content of the rich organic was > 0.8% w/w, the diol crystallized in wet clumps which badly adhered to the reactor walls and agitator shaft.
-
-
-
-
51
-
-
0347471359
-
-
note
-
As shown by HPLC analysis, the diol was stable in this mixture for up to 17 h at 20-25°C.
-
-
-
-
52
-
-
0347471372
-
-
note
-
4.
-
-
-
-
53
-
-
0346210191
-
-
note
-
The acid wash removes the chiral ligand. The acidic aqueous phase can then be basified with NaOH, and the ligand can be extracted into toluene. See ref 15.
-
-
-
-
54
-
-
0347471358
-
-
note
-
4 or 5-10 M NaOH solution.
-
-
-
-
55
-
-
0346210190
-
-
note
-
If the reaction stalls, additional charges of trimethylorthoacetate and TMSCl can be made.
-
-
-
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