The present invention relates to oxygen-containing heterocyclic compounds represented by the following formula (I):
1
wherein m represents an integer of 0 to 4; R
1
, R
2
, R
3
and R
4
independently represent a hydrogen atom, substituted or unsubstituted lower alkyl, etc.; R
5
represents substituted or unsubstituted lower alkoxy etc.; R
6
represents a hydrogen atom etc.; and Y represents the following formula (II):
2
wherein R
9
represents cyano etc., R
10
represents a hydrogen atom etc., R
1
represents carboxy etc., and R
2
represents a hydrogen atom etc.; and the like; or pharmaceutically acceptable salts thereof.
Nonactivated arylalkenes are effectively converted to tertiary benzylic nitriles in the presence of triflic acid and trimethylsilyl cyanide. The hydrocyanation reactions result in good to excellent yield when electron-donating groups are substituted on the benzene ring. The reaction conditions are mild and relatively safe, notably without need for handling hazardous hydrogen cyanide gas, providing