Add time:09/30/2019 Source:sciencedirect.com
Herein we report a halogenation-ring opening reaction of spiroketals in steroidal sapogenins at room temperature to gain highly valuable ω-halo enol ethers in excellent yields. Boosted by this method, we have prepared SOLASODINE (cas 126-17-0), an antitumor steroidal alkaloid, from diosgenin acetate in three steps with an overall yield of 50%.
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