| 89% |
|
Sodium trifluoroacetate (32.6 g) was suspended in toluene (213 g), and DFI (32.6 g) was added dropwise thereto at 0C. The mixture was stirred at 0C for 1 hour, and then R-CHP (44.2 g) was added thereto. The reaction solution was stirred at 0C for 1 hour, and then at 50C for 2 hours. The reaction solution was kept at 15C or lower, a 5 wt% aqueous sodium hydrogen carbonate solution (480 g) was added dropwise to the reaction solution, which was stirred at room temperature for 30 min. Subsequently, the toluene layer was separated. The toluene layer was washed three times with water (100 g), and then concentrated under reduced pressure. To the obtained residue were added toluene (40 g) and hexane (80 g), and the mixture was crystallized at 0C. The obtained crystal was collected by filtration, and dried at 40C for 12 hours under reduced pressure to obtain a target compound. Amount 39.3 g Yield 89% Stereoisomer ratio S-CHP:R-CHP=99.9:0.1 1H-NMR (toluene-d8, 400 MHz) delta 7.23-7.20 (m, 2H), 7.13-6.98 (m, 3H), 5.11-4.99 (m, 2H), 3.93 (bs, 1H), 3.46-3.12 (m, 4H), 1.65-1.45 (m, 1H), 1,45-1.30 (m, 1H) The stereoselectivity in the reaction was determined by using the concentrated residue before crystallization and using the peak area ratio of S-CHP and R-CHP under an HPLC analysis condition 6. S-CHP:R-CHP=99.8:0.2 |
| 85% |
|
Sodium trifluoroacetate (2.04 g) was suspended in toluene (10 g), and PPDA (3.35 g) was added dropwise thereto at 0C. The mixture was stirred at 0C for 1 hour, and then R-CHP (1.11 g) was added thereto. The reaction solution was stirred at 0C for 1 hour, and then at 50C for 2 hours. To the reaction solution was added toluene (20 g), and the mixture was kept at 15C or lower, and added dropwise to an ice-cooled, 5 wt% aqueous sodium hydrogen carbonate solution (30 g). The reaction solution was stirred at room temperature for 30 min, and then the toluene layer was separated. The toluene layer was washed three times with water (20 g), and then concentrated under reduced pressure to obtain a residue as a pale brown solid containing a target compound. Amount 0.94 g Yield 85% The stereoselectivity in this reaction was determined from the peak area ratio of S-CHP and R-CHP under an HPLC analysis condition-6. Stereoisomer ratio S-CHP:R-CHP=96:4 1H-NMR (toluene-d8, 400 MHz) was consistent with that in Example 29. |
| 78% |
|
Sodium trifluoroacetate (2.04 g) was suspended in toluene (10 g), and BDDF (2.07 g) was added dropwise thereto at 0C. The mixture was stirred at 0C for 1 hour, and then R-CHP (1.11 g) was added thereto. The reaction solution was stirred at 0C for 1 hour, and then at 50C for 2 hours. To the reaction solution was added toluene (20 g), and the mixture was kept at 15C or lower, and added dropwise to an ice-cooled, 5 wt% aqueous sodium hydrogen carbonate solution (30 g). The reaction solution was stirred at room temperature for 30 min, and then the toluene layer was separated. The toluene layer was washed three times with water (20 g), and then concentrated under reduced pressure to obtain a residue as a pale brown solid containing a target compound. Amount 0.87 g Yield 78% The stereoselectivity in this reaction was determined from the peak area ratio of S-CHP and R-CHP under an HPLC analysis condition-6. Stereoisomer ratio S-CHP:R-CHP=94:6 1H-NMR (toluene-d8, 400 MHz) was consistent with that in Example 29. |
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