Table 1.

Synthesis of compounds 3 a–f.

Compound	R1	R2	Yield [%]
3 a	−CH3	H	85
3 b	−CH3	F	47
3 c	−CH2−CH3	F	61
3 d	−(CH2)2−CH3	F	49
3 e	−N(CH2)4	F	54
3 f	−N(CH3)2	F	57