1341192-62-8Relevant articles and documents
Synthesis of bis(amino)pyridines by the stepwise alkylation of bis(imino)pyridines: An unexpected and selective alkylation of the aminoiminopyridine by AlMe3
Tay, Boon-Ying,Wang, Cun,Chia, Sze-Chen,Stubbs, Ludger P.,Wong, Pui-Kwan,Van Meurs, Martin
, p. 6028 - 6033 (2011)
Bis(imino)pyridines 2-[2,6-(R1)2C6H 3N=C(CH3)]-6-[2,6-(R2)2C 6H3N=C(CH3)](C5H3N)(1a, R1 = R2 = i-Pr; 1b, R1 = i-Pr, R2 = CH3; 1c, R1 = R2 = CH3) were first alkylated by AlMe3 and then hydrolyzed to aminoiminopyridines 2-[2,6-(R1)2C6H3N=C(CH 3)]-6-[2,6-(R2)2C6H 3NHC(CH3)2](C5H3N)(3a, R1 = R2 = i-Pr; 3b, R1 = i-Pr, R2 = CH3; 3c, R1 = R2 = CH3). When the aminoiminopyridines were treated with AlMe3, the expected methane elimination was not found; alkylation at the imine functional group led to the aluminum complexes {2-[2,6-(R1)2C6H 3NC(CH3)2]-6-[2,6-(R2) 2C6H3NHC(CH3)2]-(C 5H3N)}AlMe2 (4a, R1 = R2 = i-Pr; 4b, R1 = i-Pr, R2 = CH3; 4c, R 1 = R2 = CH3), which were further hydrolyzed to the bis(amino)pyridines 2-[2,6-(R1)2C6H 3NHC(CH3)2]-6-[2,6-(R2) 2C6H3NHC(CH3)2](C 5H3N)(5a, R1 = R2 = i-Pr; 5b, R 1 = i-Pr, R2 = CH3; 5c, R1 = R 2 = CH3). The selective alkylation over elimination may come from the noninnocent property of the conjugated iminopyridine group. New magnesium, yttrium, and zirconium complexes supported by 5a ({2,6-[2,6-(i-Pr) 2C6H3NC(CH3)2] 2(C5H3N)}Mg(THF)(6), {2,6-[2,6-(i-Pr) 2C6H3NC(CH3)2] 2(C5H3N)}Y(CH2SiMe3)(THF)(7), and {2,6-[2,6-(i-Pr)2C6H3NC(CH3) 2]2(C5H3N)}Zr(CH 2SiMe3)2 (8)) were formed via the alkane elimination method.