Total Synthesis of (±)-Tremulenolide A and (±)-Tremulenediol A via a Stereoselective Cyclopropanation/Cope Rearrangement Annulation Strategy
作者:Huw M. L. Davies、Brian D. Doan
DOI:10.1021/jo971577a
日期:1998.2.1
Short total syntheses of (+/-)-tremulenolide A (1) and (+/-)-tremulenediol A (2) are described. The critical step is a dirhodium tetracarboxylate-catalyzed tandem cyclopropanation/Cope rearrangement between the vinyldiazoacetate 4 and the 2(Z),4(E)-hexadiene 5. This step results in full control of the relative stereochemistry at the three stereogenic centers that exist in the natural products. Due
Asymmetric synthesis of the tremulane skeleton by a tandem cyclopropanation/cope rearrangement
作者:Huw M.L. Davies、Brian D. Doan
DOI:10.1016/0040-4039(96)00723-x
日期:1996.6
A highly diastereoselective and enantioselective 3 + 4 annulation method for the synthesis of polycyclic systems was achieved in a two step sequence consisting of an asymmetric intramolecular cyclopropanation catalyzed by dirhodium(II) tetrakis((R)-N-(p-(dodecyl)phenylsulfonyl)prolinate) followed by a Cope rearrangement of the resulting divinylcyclopropane intermediate.