185  US 9,958,775 B2  186  -continued  distilled off at reduced pressure to obtain 14.8 g of a  compound (A-17).  \ $_{0 }$ 0  I  A-13  Synthesis Example 6: Synthesis of Compound  (A-25)  After 10 g of a compoundA-13a was dissolved in 200 mL  of methanol and 8.0 g of triphenylsulfonium bromide was  added thereto, and the mixture was stirred for 4 hours at  room temperature. After 200 mL of ethyl acetate and 200 mL  of distilled water were added to the obtained reaction  solution, the obtained solution was moved to a separating  funnel and the aqueous layer was removed. Thereafter, the  organic layer was washed with 200 mL of distilled water for  three times, and then a solvent of the organic layer was  distilled off at reduced pressure to obtain 14.9 g of a  compound (A-13).  $^{1}$H-NMR (CDC1$_{3}$ :  ppm)  Ii:  1.32 (9H, s), 3.36 (6H, s), 4.64  (4H, s), 7.46 (2H, s), 7.76-7.65 (15H, m).  After 10 g of a compound (A-25a) was dissolved in 200  mL of methanol and 6.1 g of triphenylsulfonium bromide  was added thereto, and the mixture was stirred for 4 hours  at room temperature. After 200 mL of ethyl acetate and 200  mL of distilled water were added to the obtained reaction  solution, the obtained solution was moved to a separating  funnel and the aqueous layer was removed. Thereafter, the  organic layer was washed with 200 mL of distilled water for  three times, and then a solvent of the organic layer was  distilled off at reduced pressure to obtain 17 .7 g of a  compound (A-25).  $^{1}$H-NMR (CDC1$_{3}$ :  ppm)  Ii:  3.42 (6H, s), 4.61 (4H, s),  7.85-7.68 (15H, m), 8.19 (2H, s).  The other compound (A) shown in Table 1 was synthe› sized using the same method as a synthetic method of the  compound (A) described above.  For comparison, compounds (R-1) and (R-2) shown in  Table 1 were used.  After 10 g of a compoundA-17a was dissolved in 200 mL  of methanol and 7.7 g of triphenylsulfonium bromide was 60  added thereto, and the mixture was stirred for 4 hours at  room temperature. After 200 mL of ethyl acetate and 200 mL  of distilled water were added to the obtained reaction  solution, the obtained solution was moved to a separating  funnel and the aqueous layer was removed. Thereafter, the  65  organic layer was washed with 200 mL of distilled water for  three times, and then a solvent of the organic layer was  <Synthesis of Another Compound (A)>  <Reference Compound>  Synthesis Example 5: Synthesis of Compound  (A-17)  0  F  F  F  0  \  -o-~---1  ++-~-o_____r-\______Jo  II  II  ~- o  F  F  F  0  -- A-17a  0  II  -o-s  1  1  O  \  II  0  F  F  F  II  ~  0  A-17  [Chem. 106]  [Chem. 107]  Na+  0- 0  F  F  F  0  II  I  I  I  II  -o-s  S-0  II  II  CF 3  -- 0  F  F  F  0  0- A-25a  Q  usu  0- 0  F  F  F  0  II  I  I  I  II  -o-s  S-0  CF3  II  II  0  F  F  F  0  0- A-25 