| 摘要 |
The present invention relates to a method for the synthesis of a compound having the following general formula:
the method comprising the step of reacting, in presence of a diprotic acid having a negative pKa, a compound having the general formula:
wherein R 1 and R 2 are organic groups and wherein X and Y are independently selected from the group consisting of hydrogen, chloro, bromo, iodo, boronic acid, boronate esters, borane, pseudohalogen and organotin. It further relates to compounds so obtained and to compounds resulting from the ring closure of compound (II). |
