Table 2.

Deprotection of 3 a‐f to give compounds 4 a–f.

Compound	R1	R2	Yield [%]
4 a	−CH3	H	78
4 b	−CH3	F	89
4 c	−CH2−CH3	F	95
4 d	−(CH2)2−CH3	F	98
4 e	−N(CH2)4	F	84
4 f	−N(CH3)2	F	85