Patent ID: 6020503
Filing Date: 2000-02-01
Classification: C07D,Y02P

Abstract:
A process for preparation of a 1,4-benzodioxane derivative represented by the following formula (1), which is characterized in cyclizing a phenol derivative represented by the following formula (4) by heat-treatment or by treatment with a base or a fluoride salt, ##STR6## wherein in the above formulae (1) and (4) , R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and are hydrogen, halogen, hydroxy, nitro, cyano, formyl, hydroxycarbonyl, alkoxycarbonyloxy in which the alkyl portion has 1-4 carbon atoms, alkyl having 1-4 carbon atoms, alkoxy having 1-4 carbon atoms, haloalkyl having 1-4 carbon atoms, N,N-dialkylamino in which the alkyl has 1-4 carbon atoms, alkylcarbonyl in which the alkyl portion has 1-4 carbon atoms, alkoxycarbonyl in which the alkyl portion has 1-4 carbon atoms, or phenyl which may be substituted by one or more alkyls having 1-4 carbon atoms, and adjacent two groups of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 may constitute a methylenedioxy, or may constitute a benzene ring.