Synthesis of Entecavir (BMS-200475)
2012
A synthesis of Entecavir (BMS-200475) was achieved starting from 1,3-propanediol in 15 steps and 23.4% overall yield. A unique feature of the synthetic route is that the five-membered carbocyclic core is installed by an intramolecular nitrile oxide cycloaddition (INOC) reaction and the guanine moiety is introduced by a Mitsunobu reaction. The route is characteristic of low cost, high yield and easy operation.
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