“…The isothiocyanate group of compound 104 reacts as an S-nucleophile, resulting, via the intermediates 104a and 104b, in 2,5-dihydro-1,3,4-thiadiazole 105, and not as an N-nucleophile. These findings are consistent with the results obtained by Jochims et al [147,148]. Similarly, 3'-cyano analogue 107 was reacted with the reactive cumulenes 93 to furnish 3'-(1,2,4-triazolo)thymidines 108, which both gave the free nucleosides 106 and 109, respectively, on deblocking with NaOMe in MeOH, as shown in Scheme 26.…”