Synthesis of 2-Keto(hetero)aryl Benzox(thio)azoles through Base Promoted Cyclization of 2-Amino(thio)phenols with α,α-Dihaloketones
摘要:
An interesting base-promoted protocol for the synthesis of 2-keto(hetero)aryl benzox(thi)azoles has been developed. Starting from commercially available 2-amino(thio)phenols and alpha,alpha-dihaloketones, moderate to good yields of the corresponding heterocycles can be achieved. Notably, only EtNH2 was required as the promoter here, and the reaction can be easily performed on a large scale.
Onium amides, generated in situ from the combination of aminosilanes and onium fluorides (R(4)PF, R(4)NF), are employed for the first time as bases for catalytic deprotonative functionalization of C(sp(2))-H and activatedC(sp(3))-H bonds under mild conditions.
Skraup; Moser, Chemische Berichte, 1922, vol. 55, p. 1097
作者:Skraup、Moser
DOI:——
日期:——
Synthesis of 2-Keto(hetero)aryl Benzox(thio)azoles through Base Promoted Cyclization of 2-Amino(thio)phenols with α,α-Dihaloketones
作者:Jun Jiang、Huaxu Zou、Qizhi Dong、Ruijia Wang、Linghui Lu、Yonggang Zhu、Weimin He
DOI:10.1021/acs.joc.5b02093
日期:2016.1.4
An interesting base-promoted protocol for the synthesis of 2-keto(hetero)aryl benzox(thi)azoles has been developed. Starting from commercially available 2-amino(thio)phenols and alpha,alpha-dihaloketones, moderate to good yields of the corresponding heterocycles can be achieved. Notably, only EtNH2 was required as the promoter here, and the reaction can be easily performed on a large scale.
REDUCTION OF 1,3-AZOLE AND 1,3-BENZAZOLE CARBINOLS WITH SODIUM BOROHYDRIDE-TRIFLUOROACETIC ACID