. . . "Preferred are methods for the preparation of backbone cyclized peptide analogs of Formula (I) wherein G is an amine, thiol or carboxyl group; R and R1 are each other than H, such as CH3, (CH3)2CH???, (CH3)2CHCH2???, CH3CH2CH(CH3)???, CH3S(CH2)2???, HOCH2???, CH3CH(OH)???, HSCH2???, NH2C(???O)CH2???, NH2C(???O)(CH2)2???, HOC(???O)CH2???, HOC(???O)(CH2)2???, NH2(CH2)4???, C(NH2)2NH(CH2)3???, HO-phen" .