| 摘要 |
A compound of the general formula: <IMAGE> wherein R1 is a lower alkyl group; R2 is H or a lower alkyl group; Y is an oxo group, H or an unprotected or protected hydroxyl group; X is a methylene or ethylene group, for example, 7,7a-dihydro-7aS-methyl-4-(3-butenyl)-1-tert. butoxy-5(6H)-indanone, which is an intermediate for steroids, is prepared by dehydrative cyclization of a compound of the general formula of <IMAGE> wherein R1, R2, X and Y are the same as above.
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