Oligomeric isoflavonoids. Part 4.† Synthesis of the daljanelin class of isoflavonoid–neoflavonoid dimers
1999
A protocol of introducing an electrophilic C1 fragment to a pterocarpan nucleus, followed by anionic coupling of a C6–C2 benzofuranoid precursor and late introduction of the final C6 fragment, permitted the syntheses of daljanelins B 3 and D 5. The feasibility of introducing the same electrophilic C1 fragment to C-2 of the pterocarpan moiety to obtain a precursor to daljanelin A 2 was also demonstrated.
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