|
|
|
|
Asymmetric Tandem Claisen-Ene Strategy for Convergent Synthesis of (+)-9(11)-Dehydroestrone Methyl Ether : Stereochemical Studies on the Ene Cyclization and Cyclic Enol Ether Claisen Rearrangement for steroid Total Synthesis
K. Mikami, K. Takahashi, T. Nakai, and T. Uchimaru
[Journal of the American Chemical Society, pp. 116, 1994]