Synthesis of dihalocarbene derivatives of estafiatin guaianolide

Adducts of dihalocarbenes generated from chloroform and bromoform were prepared by reaction with estafiatin guaianolide. Their structures were established by XSA. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 453–455, September–October, 2007.     

New reaction of mononitroarenes: Condensation with two acetophenone moleculesvia the nitro group

Nitrobenzene,p-bromonitrobenzene,N,N-diethyl-p-nitroaniline, and 9-methyl-3nitrocarbazole undergo condensation with two moles of acetophenone in a DMSO-KOH system to form the corresponding (Z)-1,4-diphenyl-2-arylamino-2-butene-1,4-diones.Translated from Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 480–482, February, 1996     

Structure of 2-Amino-4-phenyl-9H-pyrimido[4,5-b]indole and Its Nitrate in Crystal and Solution

The crystal structures of 2-amino-4-phenyl-9H-pyrimido[4,5-b]indole and its nitrate were determined by XRD analysis. ¹³C NMR, XRD, and quantum-chemical data indicate that the acid proton is predominantly localized at the N(3) atom of the pyrimidine ring in both isolated nitrate molecules and in molecules in crystal and solution.     

Sesquiterpene Lactones and Flavonoids from <Emphasis Type="Italic">Artemisia albida</Emphasis>

The five known lactones matricarin, austricin, canin, and achillin guaianolides and argolide germacranolide and the two flavonoids eupatilin and its 7-O-methyl ester were isolated for the first time from the aerial part of Artemisia albida Willd. The structure of eupatilin was confirmed by an x-ray structure analysis. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 568–570, November–December, 2005.     

Synthetic Transformations of Higher Terpenoids: IX. Nitrogen-Containing Heterocyclic Compounds on the Basis of Lambertianic Acid

Oxidation of lambertianic acid methyl ester and methyl 15,16-epoxy-17-hydroxylabda-13(16)14-dien-18-oate gave 17-nor-8-oxo-, 8,12-epoxy-17-hydroxy-, and 8-formyl-17-norlabdadienoic acid esters which were subjected to reductive amination, and the subsequent intramolecular aminomethylation of 17-nor-8(R)-methylamino- and 17-methylaminolabdadienoates with formaldehyde afforded new polycyclic compounds, furoazocine and furoazonine derivatives.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 4, 2005, pp. 547–556.Original Russian Text Copyright © 2005 by Chernov, Shul’ts, Shakirov, Bagryanskaya, Gatilov, Tolstikov.For communication VIII, see [1].     

Crystal structure of koraiol — A sesquiterpene alcohol with a new type of carbon skeleton from the oleoresin ofPinus koraiensis

An x-ray structural investigation has been made of a new sesquiterpene alcohol — koraiol — in the form of its complex with pyridine (2:1). The cyclobutane rings are nonplanar and the foldings of rings A and B amount to 17 and 31°, respectively. The seven-membered ring has the chair form.     

Synthesis and Structure of Triphenylbismuth Bis(Fluorobenzoates)

The reaction between triphenylbismuth, hydrogen peroxide, and 3,4,5-trifluorobenzoic or pentafluorobenzoic acid (molar ratio 1 : 1 : 2, respectively) in ether gave triphenylbismuth bis(3,4,5-trifluorobenzoate) (I) and triphenylbismuth bis(pentafluorobenzoate) (II) in 74 and 89% yields, respectively. The structures of compounds I and II were established by X-ray diffraction. The Bi atoms have a distorted trigonal-bipyramidal coordination with acylate groups in the axial positions. The OBiO angles are 170.2(2)° and 171.5(2)° in I and II, respectively. The Bi–C(Ph)_eq bond lengths vary in the range of 2.187(6)–2.204(5) Å, the Bi–O(acyl) lengths are 2.256(5) Å in I, and 2.281(5) and 2.318(5) Å in II. In the crystals I and II, the Bi and carbonyl O atoms are involved in intramolecular interactions (Bi···O(=C) 2.926(5)–3.176(5) Å), which increase the equatorial CBiC angles on the side of these contacts to 136.2(3)° and 138.6(2)° in I and II, respectively.     

Crystal Structure of Lappaconitine Hydrobromide Hydrate

The structure of lappacontine hydrobromide hydrate was solved by an x-ray structure analysis.