Several S'-alkyl (or ary1) thio-5'-deoxyadenosines have been synthesized from 3, 16917 but the preparation of 3 involves tedious steps because of its easy transformation into an N3, 5'- cycloadenosine derivative. 18 Thus, the method described above might be a readily accessible route for the preparation of 5'-alkyl (or ary1) thio-5'-deoxyadenosines, since la can be easily prepared from adenosine." 6-chloroinosine (4a) according to the method of ...