A two-step method for the preparation of 3-0-(beta-carboxypropionyl-18-beta-glycyrrhetic acid (carbenoxolone) is disclosed, which comprises the steps of condensing beta-glycyrrhetic acid with anhydrous beta-carbobenzyloxypropionic acid (or a derivative thereof such as its chloride or anhydride), the result being 3-O-(beta-carbobenzyloxypropionyl)-11-oxo-18-beta-olean-12-en-30-oic acid, the latter compound being then debenzylated with hydrogen under normal temperature and pressure conditions, in an alcoholic solvent (alcohols having from C.sub.1 to C.sub.5) and in the presence of catalytic amounts of a noble metal (e.g. palladium), thus obtaining the expected compound.
PINZA M.; PIFFERI G., FARMACO. ED. SCI., 1978, 33, NO 8, 595-603
作者:PINZA M.、 PIFFERI G.
DOI:——
日期:——
Mechanism-Based Isocoumarin Inhibitors for Human Leukocyte Elastase. Effect of the 7-Amino Substituent and 3-Alkoxy Group in 3-Alkoxy-7-amino-4-chloroisocoumarins on Inhibitory Potency
作者:John E. Kerrigan、Jozef Oleksyszyn、Chih-Min Kam、Joe Selzler、James C. Powers
DOI:10.1021/jm00003a017
日期:1995.2
prepared and evaluated as inhibitors of human leukocyte elastase (HLE). In addition, a new series of acyl, urea, and carbamate derivatives of 7-amino-4-chloro-3-methoxyisocoumarin (1), 7-amino-4-chloro-3-propoxyisocoumarin (3), and 7-amino-4-chloro-3-(2-bromoethoxy)isocoumarin (6) have been synthesized. Most of the synthesized compounds are very potent inhibitors of HLE with kobs/[I] values between 10(4)
已经制备了具有各种3-烷氧基取代基的一系列3-烷氧基-7-氨基-4-氯异香豆素,并将其评估为人白细胞弹性蛋白酶(HLE)的抑制剂。此外,还推出了一系列新的7-氨基-4-氯-3-甲氧基异香豆素(1),7-氨基-4-氯-3-丙氧基异香豆素(3)和7-氨基-香豆素的酰基,脲和氨基甲酸酯衍生物已经合成了4-氯-3-(2-溴乙氧基)异香豆素(6)。大多数合成的化合物都是非常有效的HLE抑制剂,其kobs / [I]值在10(4)和10(6)M-1 s-1之间。异香豆素环7-氨基位置的疏水取代基为HLE提供了最佳的选择性和抑制能力。在2-溴乙氧基系列中,具有PhNHCONH 7取代基的化合物24的kobs / [I]值为1.2 x 10(6)M-1 s-1,对HLE具有很高的选择性,并且是最有效的HLE抑制剂。经过HLE测试。在长链L-苯丙氨酰基衍生物中,kobs / [I]值为1.8 x 10(5)M-1
Self-Assembled Arrays of Dendrimer-Gold-Nanoparticle Hybrids for Functional Cell Studies
Dendrimer‐controlled cell growth: A dendrimer–gold‐nanoparticle hybridarray (see picture; PEG=polyethylene glycol), which can control the apparent dendrimer surface density, was used to investigate cell adhesion. The effect of the macromolecular architecture on the attachment and the morphological development of endothelial cells was studied. The dendrimer outperformed a linear counterpart, most likely