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Table 3 Influence of the ratio of DMI to HMPA on the stereoselective electroreduction of 7K-LCA

From: Study on synthesis of ursodeoxycholic acid by reduction of 7-ketolithocholic acid in double aprotic solvents and molecular simulations

Solvents

Conversion of 7K-LCA (%)

Yield of UDCA (%)

Yield of CDCA (%)

10%HMPA + 90%DMI

73.1 ± 1.4

28.3 ± 1.6

13.5 ± 0.5

15%HMPA + 85%DMI

82.2 ± 0.3

31.6 ± 0.5

16.4 ± 0.3

20%HMPA + 80%DMI

86.7 ± 0.4

34.3 ± 0.2

20.7 ± 0.2

30%HMPA + 70%DMI

93.8 ± 0.2

39.4 ± 0.4

22.4 ± 0.3

40%HMPA + 60%DMI

93.9 ± 0.3

50.4 ± 0.5

23.1 ± 0.4

50%HMPA + 50%DMI

94 ± 0.7

67.8 ± 0.3

25.3 ± 0.2

60%HMPA + 40%DMI

92 ± 0.3

58.9 ± 0.4

27 ± 0.5

70%HMPA + 30%DMI

95 ± 1.4

58.6 ± 0.8

28.4 ± 0.9

80%HMPA + 20%DMI

96.7 ± 0.7

58.5 ± 0.7

30 ± 0.7

90%HMPA + 10%DMI

97.7 ± 0.5

47 ± 0.6

35.6 ± 0.5