3,4-Dialkoxypyrroles and 2,3,7,8,12,13,17,18-Octaalkoxyporphyrins
作者:Andreas Merz、Roland Schropp、Eleonore Dötterl
DOI:10.1055/s-1995-3993
日期:1995.7
A five-step general synthesis of 3,4-dialkoxypyrroles 7c-f is described starting with the condensation of dimethyl N-benzyliminodiacetate (1b) and diethyl oxalate to give dimethyl 1-benzyl-3,4-dihydroxypyrrole-2,5-dicarboxylate (2b), which is bis-O-alkylated to the corresponding 3,4-diethers 3c-g. Pyrrole N-benzyl cleavage followed by ester hydrolysis and decarboxylation leads to 7c-f in 10-50% overall yield. Pyrroles 7c-f react with formaldehyde or benzaldehydes to give meso-H- (8a-d) or meso-tetraaryloctaalkoxyporphyrins 9a-g in moderate yields.
What is described is a compound of formula I
consisting of a compound in which
R
1
is a branched chain alkyl consisting of 10 to 31 carbons;
R
2
is a linear alkyl, alkenyl, or alkynyl consisting of 2 to 20 carbons, or a branched chain alkyl consisting of 10 to 31 carbons;
L
1
and L
2
are the same or different, each a linear alkane of 1 to 20 carbons or a linear alkene of 2 to 20 carbons;
X
1
is S or O;
R
3
is a linear or branched alkylene consisting of 1 to 6 carbons; and
R
4
and R
5
are the same or different, each a hydrogen or a linear or branched alkyl consisting of 1 to 6 carbons; or
a pharmaceutically acceptable salt thereof.
acid, a model dipyrrinone for one-half of the bilirubin molecule in photochemical and metabolism studies, is more polar than bilirubin and insoluble in water and in chloroform. Replacing the β-alkyl substituents on the lactam ring of xanthobilirubinic acid with methyl-capped ethylene glycol, diethylene glycol, and triethylene glycol (PEG) groups steadily increased the water solubility of the pigment
摘要在光化学和新陈代谢研究中,黄胆红素酸是一种模型的吡啶酮,在胆红素分子中占一半,比胆红素极性更强,不溶于水和氯仿。用甲基封端的乙二醇,二甘醇和三甘醇(PEG)基团取代黄胆红酸内酰胺环上的β-烷基取代基稳定地增加了颜料的水溶性,因此最后一种颜料完全溶于水和氯仿中。通过碱催化缩合相应的甲基封端的3,4-diPEG-吡咯啉-2-酮与3,5-二甲基-4(2-乙氧基羰基乙基)-2-甲酰基-1 H合成-吡咯,这些新的黄胆红素酸的聚乙二醇化类似物是黄色的二吡啶酮,它们在氯仿溶液中形成分子间氢键合的二聚体,但在甲醇和水中是单体,如1 H NMR光谱和蒸气压渗透压法所揭示的。黄嘌呤胆红素甲酯已被用作胆红素类化合物的合成前体。它的两亲性聚乙二醇化类似物暗示了一条通往水溶性胆红素和双肝素类化合物的途径。 图形概要