Li JT, Li TS, Li LJ, Yang ZQ. Ultrasound-promoted preparation of disteryl ethers catalyzed by montmorillonite K 10.
ULTRASONICS SONOCHEMISTRY 1998;
5:83-85. [PMID:
11270342 DOI:
10.1016/s1350-4177(98)00010-8]
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Abstract
In the presence of montmorillonite K 10, 5(6)-unsaturated sterols (1) were heated under ultrasound at 45 degrees C in dichloromethane for 2-5.5 h to provide 3 beta,3'beta-5(6)/5'(6')-unsaturated disteryl ethers (2) in 35-79% yield. Meanwhile, 3 alpha,3'alpha-diandrost-5-en-17-one-3-yl ether (3a) and 3 alpha,3'alpha-dipregn-5-en-20-one-3-yl ether (3b) were also obtained as by-products from 3 beta-hydroxyl-androst-5-en-17-one (1a) and 3 beta-hydroxyl-pregnan-5-en-20-one (1b) respectively.
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