Amination of meso-bromophenyl(polyalkyl)porphyrins: Synthesis of porphyrins containing a hydroxypiperidine fragment
作者:G. A. Artamkina、P. K. Sazonov、M. M. Shtern、G. V. Grishina、I. S. Veselov、A. S. Semeikin、S. A. Syrbu、O. I. Koifman、I. P. Beletskaya
DOI:10.1134/s1070428008030184
日期:2008.3
5,15-Bis(4-bromophenyl)-2,8,12,18-tetraethyl-3,7,13,17-tetramethylporphyrin and 5-(4-bromophenyl)-13,17-dibutyl-2,3,7,8,12,18-hexamethylporphyrin were synthesized, and their palladium-catalyzed amination with a number of cyclic secondary amines, including hydroxypiperidines, was studied [Pd(OAc)2, ligand, THF or dioxane, t-BuONa, 80–100°C]. The reactions of the meso-bromophenylporphyrins with piperidine and morpholine gave the corresponding amination products in quantitative yield. The amination with hydroxypiperidines required excess amine (3 equiv per bromine atom) and excess base (6–8 equiv) and was accompanied by formation of hydrodebromination products; in the reactions with the bis(bromophenyl)derivative, mixed products resulting from amination at one phenyl group and reductive debromination at the other were also formed. The yields of the amination products varied from good 75–50% in the reactions with 4-hydroxypiperidine and trans-3-hydroxy-4-[4-(2-fluorophenyl)piperazin-1-yl]piperidine} to moderate (20–50%, 3-hydroxypiperidine) and poor [11–25%, trans-3,4-dihydroxypiperidine and trans-3-hydroxy-4-(4-hydroxypiperidin-1-yl)piperidine].
合成了 5,15-双(4-溴苯基)-2,8,12,18-四乙基-3,7,13,17-四甲基卟啉和 5-(4-溴苯基)-13,17-二丁基-2,3,7,8,12,18-六甲基卟啉、并研究了它们与一些环状仲胺(包括羟基哌啶)的钯催化胺化反应[Pd(OAc)2,配体,THF 或二氧六环,t-BuONa,80-100°C]。中溴代苯基卟啉与哌啶和吗啉的反应得到了相应的胺化产物,且产率很高。与羟基哌啶的胺化反应需要过量的胺(每个溴原子 3 个等量物)和过量的碱(6-8 个等量物),并伴随着氢脱溴产物的形成;在与双(溴苯基)衍生物的反应中,还形成了由一个苯基上的胺化反应和另一个苯基上的还原脱溴反应产生的混合产物。胺化产物的收率有高有低在与 4-羟基哌啶和反式-3-羟基-4-[4-(2-氟苯基)哌嗪-1-基]哌啶的反应中为 75-50%},也有中等收率(20-50%,3-羟基哌啶)和低收率(11-25%,反式-3,4-二羟基哌啶和反式-3-羟基-4-(4-羟基哌啶-1-基)哌啶)。