Perindoprilat monohydrate

The title compound [systematic name: (1S)-2-((S)-{1-[(2S,3aS,7aS)-2-carboxyoctahydro-1H-indol-1-yl]-1-oxopropan-2-yl}azaniumyl)pentanoate monohydrate], C(17)H(28)N(2)O(5)·H(2)O, (I)·H(2)O, the active metabolite of the antihypertensive and cardiovascular drug perindopril, was obtained during polymorphism screening of perindoprilat. It crystallizes in the chiral orthorhombic space group P2(1)2(1)2(1), the same as the previously reported ethanol disolvate [Pascard, Guilhem, Vincent, Remond, Portevin & Laubie (1991). J. Med. Chem. 34, 663-669] and dimethyl sulfoxide hemisolvate [Bojarska, Maniukiewicz, Sieroń, Fruziński, Kopczacki, Walczyński & Remko (2012). Acta Cryst. C68, o341-o343]. The asymmetric unit of (I)·H(2)O contains one independent perindoprilat zwitterion and one water molecule. These interact via strong hydrogen bonds to give a cyclic R(2)(2)(7) synthon, which provides a rigid molecular conformation. The geometric parameters of all three forms are similar. The conformations of the perhydroindole group are almost identical, but the n-alkyl chain has conformational freedom. A three-dimensional hydrogen-bonding network of O-H···O and N-H···O interactions is observed in the crystal structure of (I)·H(2)O, similar to the other two solvates, but because of the presence of different solvents the three crystal structures have diverse packing motifs. All three solvatomorphs are additionally stabilized by nonclassical weak C-H···O contacts.

Novel pseudopolymorph of the active metabolite of perindopril

The dimethyl sulfoxide hemisolvate of perindoprilat [systematic name: (1S)-2-((S)-{1-[(2S,3aS,7aS)-2-carboxyoctahydro-1H-indol-1-yl]-1-oxopropan-2-yl}azaniumyl)pentanoate dimethyl sulfoxide hemisolvate], C(17)H(28)N(2)O(5)·0.5C(2)H(6)OS, an active metabolite of perindopril, has been synthesized, structurally characterized by single-crystal X-ray diffraction and compared with its ethanol disolvate analogue [Pascard et al. (1991). J. Med. Chem. 34, 663-669]. Both compounds crystallize in the orthorhombic P2(1)2(1)2(1) space group in the same zwitterionic form, with a protonated alanine N atom and an anionic carboxylate group at the n-alkyl chain. The three structural units present in the unit cell (two zwitterions and the solvent molecule) are held together by a rich system of O-H···O, N-H···O and C-H···O hydrogen-bond contacts.

[Influence of newly synthesized sesquiterpenes--analogs of taxol on multiplication of herpes simplex virus (HSV-1MC) and retrovirus (Mo-MSV)]

The study comprised newly synthesized sesquiterpenoid analogs of taxol. The synthesis of the compounds was performed at the Institute of Organic Chemistry, Polish Academy of Sciences. Cytotoxicity of the compound was assessed using formazan method. In in vitro studies the cell cultures were infected with HSV-1MC. The tested compounds were added in different concentrations to the cell culture after viral infection. Titer of the virus was expressed in TCID50/ml at particular stages of the experiments. In in vivo experiments NMRI mice were infected intramuscularly with a Moloney murine sarcoma virus (Mo-MSV). Tested compounds were administered to the mice intravenously on the day of virus inoculation. In Mo-MSV-infected mice dynamics of tumor progression and regression was assessed, as well as a mean time interval of tumor disappearance. Among the compounds tested: isovellerol-13-N-benzoyl-(2'R,3'S)-3'-phenylisoserinate, 5-deoxy-lactarolid B 8-[N-benzoyl-(2'R,3'S)-3'-phenylisoserinate] and isolactarorufin 8-epi-[N-benzoyl-(2'R,3'S)-3'-phenylisoserinate] showed significant antiviral activity in in vitro experiments. In in vivo experiments only lactarorufin A 8-[N-benzoyl-(2'R,3'S)-3'-phenylisoserinate] significantly inhibited the development of tumors and shortened the time of their total regression in the course of Mo-MSV infection.

Synthesis and antifeedant properties of N-benzoylphenylisoserinates of Lactarius sesquiterpenoid alcohols

The esterification of various sesquiterpenoid alcohols of Lactarius origin with N-benzoyl-[2R,3S]-phenylisoserine (side chain of Taxol) produced compounds whose antifeedant properties against storage pests Tribolium confusum, Trogoderma granarium and Sitophylus granarius were measured. The introduction of the taxol side chain in these molecules, in comparison to original compounds, moderately enhanced their antifeedant activities, as well as changed their selectivity of activity towards the test insects.