A facile and efficient protocol for palladium-catalyzed Miyaura borylation reaction of chloropyrazines with B2pin2 has been developed. A certain range of difficult-to-access pyrazine boronic esters can be easily prepared from the corresponding chloropyrazines in moderate to good yields.
NITROGENOUS HETEROCYCLIC COMPOUND AND MEDICINE THEREOF
申请人:Eisai Co., Ltd.
公开号:EP1484327A1
公开(公告)日:2004-12-08
Compounds represented by the following general formula:
[wherein X1, X2, X3 and X4 each independently represent a single bond, C1-6 alkylene, etc.; A2 represents optionally substituted phenyl, etc.; A1 represents an optionally substituted 5- to 7-membered heterocyclic group containing -C(=Q1)- (wherein Q1 represents oxygen, sulfur or =N-R11 (wherein R11 represents hydrogen or C1-6 alkyl)) and nitrogen, etc.; and Z1 represents piperidin-diyl, etc.],
salts thereof and hydrates of the foregoing.