Pe. Maligres et al., DIASTEREOSELECTIVE SYN-EPOXIDATION OF 2-ALKYL-4-ENAMIDES TO EPOXYAMIDES - SYNTHESIS OF THE MERCK HIV-1 PROTEASE INHIBITOR EPOXIDE INTERMEDIATE, Tetrahedron letters, 36(13), 1995, pp. 2195-2198
Reaction of 2-alkyl-4-enamides 2, 9-15 with NIS and aqueous sodium bic
arbonate results in the diastereoselective formation of the correspond
ing iodohydrins 3, 16-22 with essentially no iodolactone by-product. T
his methodology has been successfully employed for the synthesis of th
e epoxide intermediate 4 of the orally active Merck HIV-I protease inh
ibitor L-735,524.