Two-directional synthesis of bifurans
Palladium-catalyzed asymmetric synthesis of 2-alkynyl oxacycles
Table 3
The high kinetic selectivity exhibited in the cyclization ought to permit the stereodefined synthesis of such frameworks, and towards this end, we prepared a selection of substrates to investigate a two-directional formation of bicyclic oxacycles.[8] Our prediction for these substrates (12a–d, Table 3) was that the bifuran product 13 would be kinetically favored over the fused-ring pyranopyran 14.
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