Chiral pool synthesis of 4a-substituted carbocyclic cyclopentanoid nucleoside precursors, II

Suitable protected 4,4a-anhydro-cyclopentane derivatives have been used for the straightforward of cyclopentanoid nucleoside precursors. Thus, by simp le transformations nucleoside precursors modified at the positions C(4), C( 4a) and C(4,4a) as well as side-chain modified derivatives were accessible. The structures of the key intermediates were determined by x-ray analyses.