Abstract: Compounds of formula (I), wherein A′ and A″ are independently the same or different group of formula (II) wherein: R′ is H, CH3, C(CH3)2, —ORa, —N(Ra)2, —N(Ra)ORa or —DP; R′″ is H or CH3; Ra is H, C1-C3 alkyl; D is a bond, alkylene, —C(═O)—, —S(O)— or S(O)2—; P is an optionally substituted, mono or bicyclic carbo- or hetereocycle; R″ is H, any of the sidechains found in the natural amino acids, carboxacetamide, or a group (CH2)nDP; M is a bond or —C(═O)N(R′″)—; Q is absent, a bond, —CH(OH)— or CH2—; or R″ together with Q, M and R′ define an optionally substituted 5 or 6 membered carbo- or heterocyclic ring which is optionally fused with a further 5 or 6 membered carbo- or heterocyclic ring; with the proviso that R′ is —ORa, —, N(Ra)2, —N(Ra)ORa or -DP, if M is a bond and Q is absent; X is H, OH, OCH3, Y is H, OH, OCH3, but X and Y are

Abstract: Compounds of formula (I), wherein A and A are independently the same or different group of formula (II) wherein: R′ is H, CH3, C(CH3)2,—ORa, —N(Ra)2, —N(Ra)ORa or -DP; R is H or CH3; Ra is H, C1-C3 alkyl; D is a bond, alkylene, —C(═O)—, —S(O)— or S(O)2—; P is an optionally substituted, mono or bicyclic carbo- or hetereocycle; R″ is H, any of the sidechains found in the natural amino acids, carboxacetamide, or a group (CH2)nDP; M is a bond or —C(═O)N(R′″)-; Q is absent, a bond, —CH(OH)— or CH2—; or R″ together with Q, M and R define an optionally substituted 5 or 6 membered carbo- or heterocyclic ring which is optionally fused with a further 5 or 6 membered carbo- or heterocyclic ring; with the proviso that R is —ORa, -, N(Ra)2, —N(Ra)ORa or -DP, if M is a bond and Q is absent; X is H, OH, OCH3, Y is H, OH, OCH3, but X and Y are not both H; Z′ and Z″ are independently —(

Abstract: Compounds of the formula I: wherein: A′ and A″ are independently the same or different group of the formula II: wherein: R′ is H.

Abstract: The instant disclosure is directed to cyclopentyl analogues of .alpha.- and .beta.-L-2', 3'-dideoxypurine ribonucleosides wherein the 3- and 4-cyclopentyl substituents may be either --H or --CH.sub.2 --OH.