| 摘要 |
Disclosed herein are a naphthoquinone derivative represented by the following formula: <IMAGE> (II) wherein R1 means a hydrogen atom or methyl group, R2 is a hydrogen atom or methyl group, n stands for 0 or an integer of 1-9, and a linkage is a single bond or double bond with the proviso that if n is an integer of 2-9, the linkages may be identical with or different optionally from each other, such as a vitamin K derivative; and a process for producing the naphthoquinone derivative at a high yield without forming any geometric isomer; as well as 1,4,4a,5,8,9a-hexahydro-4a alpha -alkenyl-1 alpha ,4 alpha -methanoanthraquinone derivatives and 1,4,4a,5,8,9a-hexahydro-1 alpha ,4 alpha -methanoanthraquinone derivatives which are useful as intermediates for the preparation of the naphthoquinone derivatives.
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