New intermediates for the vitamin a synthesis

Abstract

The present invention relates to the compound of formula (I). The invention further relates to the compound of formula (II). The invention further relates to the synthesis of these compounds as well as to their use in organic synthesis, especially in the synthesis of vitamin A or p-carotene and derivatives thereof, e.g. canthaxanthin, astaxanthin or zeaxanthin.

1 . A compound of formula (I) 
       
         
           
           
               
               
           
         
       
     
     
         2 . A compound of formula (II) 
       
         
           
           
               
               
           
         
       
     
     
         3 . A process of production of the compound of formula (II) 
       
         
           
           
               
               
           
         
       
       wherein the compound of formula (IV) 
       
         
           
           
               
               
           
         
       
       is reacted with acetic acid anhydride or similar to form the compound of formula (II). 
     
     
         4 . A process of production of the compound of formula (I), 
       
         
           
           
               
               
           
         
       
       wherein the compound of formula (II) 
       
         
           
           
               
               
           
         
       
       is catalytically rearranged. 
     
     
         5 . Use of the compound of formula (I) in organic synthesis. 
     
     
         6 . Use according to  claim 5 , wherein the vitamin A or β-carotene are produced (preferably vitamin A). 
     
     
         7 . Use of the compound of formula (II) in organic synthesis. 
     
     
         8 . Use according to  claim 7 , wherein the vitamin A or β-carotene are produced (preferably vitamin A).