Synthesis of 23E-ethylidene spirostanes via the BF3·Et2O-catalyzed aldol condensation of steroid sapogenins and acetaldehyde
2020
Serrano-Vázquez, Hugo A. | Flores-Alamo, Marcos | Iglesias-Arteaga, Martín A.
The treatment of acetylated steroid sapogenins with acetaldehyde and BF₃·Et₂O in CH₂Cl₂ led to moderate yields of the corresponding 23E-ethylidene spirostanes. The obtained compounds were characterized using a combination of 1D and 2D NMR techniques. Single crystal X-ray diffraction corroborated the proposed structures.
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