Compound number

R =

Ar =

Method A

Method B

3a

ـــــCH₃

C₇H₃F

90

82

3b

ـــــCH₃

C₆H₄SF₅

92

80

3c

ـــــCH₃

C₆H₅NF

91

81

3d

ـCH₃

C₆H₂Cl₂NO

92

83

3e

ـCH₃

C₁₂H₁₁NF₄

92

80