Preparation process of naphthoquinone derivatives and intermediates for the preparation thereof.

摘要

Disclosed herein are a naphthoquinone derivative represented by the following formula: <CHEM> wherein R<1> means a hydrogen atom or methyl group, R<2> 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.