Abstract
In the presence of montmorillonite K 10, 5(6)-unsaturated sterols ( 1) were heated under ultrasound at 45°C in dichloromethane for 2–5.5 h to provide 3β,3′β-5(6)/5′(6′)-unsaturated disteryl ethers ( 2) in 35–79% yield. Meanwhile, 3α,3′α-diandrost-5-en-17-one-3-yl ether ( 3a) and 3α,3′α-dipregn-5-en-20-one-3-yl ether ( 3b) were also obtained as by-products from 3β-hydroxyl-androst-5-en-17-one ( 1a) and 3β-hydroxyl-pregnan-5-en-20-one ( 1b) respectively.
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