F. A. Lakhvich

Heterocyclic analogs of prostaglandines: IV. Synthesis of 3,7-interphenylene 3,10(11)-dioxa-13-azaprostanoids and 9-oxa-7-azaprostanoids based on tetronic acid and aromatic aldehydes

An approach was developed to the synthesis of stable in metabolism 3,7-interphenylene 3,10-dioxa-13-aza-and 3,11-dioxa-13-azaprostanoids, and also 9-oxa-7-azaprostanoids with interphenylene and terminal phenyl fragments in the ω-chain based on 3-(alkoxybenzylidene)-and 3-(3-phenylallylidene)tetrahydrofuran-2,4-diones obtained by Knoevenagel condensation of tetronic acid with alkoxy-substituted aromatic aldehydes and cinnamic aldehyde.

Heterocyclic Analogs of Prostaglandins: I. Synthesis of 3-Alkyl(Aralkyl)-2,5-dihydrofuran-2-ones as Synthons for 11-Deoxy-10-oxaprostanoids

Abstract3-Acyl(arylmethyleneacyl)tetronic acids were synthesized. Selective hydrogenation of the carbonyl group in the acyl fragment and reduction of the conjugated double bond afforded in high yield the corresponding 3-alkyl(aralkyl) derivatives possessing either natural or modified prostaglandin α-chain. Reduction of the conjugated double bond in vinylogous 3-alkyl(aralkyl)tetronic acid amides with sodium cyanotrihydridoborate gave a mixture of stereoisomeric β-amino lactones which underwent retro-Michael elimination of the amine residue, leading to 3-alkyl(aralkyl)-2,5-dihydrofuran-2-ones. The latter can be regarded as synthons for 11-deoxy-10-oxaprostanoids.

Synthesis of kairomones and their analogs from 2-acylcyclohexane-1,3-diones with an unsaturated acyl side chain

Natural 2-[(9Z)-1-oxooctadec-9-en-1-yl]-, 2-[(9Z,12Z)-1-oxooctadeca-9,12-dien-1-yl]-, and 2-[(9Z,12Z,15Z)-1-oxooctadeca-9,12,15-trien-1-yl]cyclohexane-1,3-diones (components of flour moth Ephestia kuehniella kairomones) and some their analogs were synthesized from cyclohexane-1,3-diones and long-chain unsaturated carboxylic acid chlorides.

Heterocyclic analogs of prostaglandins: III*. Synthesis of 10-oxa-13-aza, 11-oxa-13-aza, and 9-oxa-7-aza prostanoids from 3-acyl- and 3-(3-arylprop-2-enoyl)furan-2,4-diones

A number of new 10-oxa-13-aza, 11-oxa-13-aza, and 9-oxa-7-aza prostanoids belonging to the B series were synthesized on the basis of 3-acyl-and 3-(3-arylprop-2-enoyl)furan-2,4(3H,5H)-diones. The scheme of synthesis includes selective hydrogenation of the exocyclic carbonyl group and reduction of the conjugated double bond in the acyl fragment of 3-acyl-and 3-(3-arylprop-2-enoyl)furan-2,4(3H,5H)-diones to obtain 3-alkyl-and 3-(3-arylpropyl)furan-2,4(3H,5H)-diones, transformation of the latter into the corresponding regioisomeric enol ethers via regioselective O-alkylation, and treatment of the enol ethers with primary aliphatic amines.

Synthesis of benzimidazolone derivatives based on 2-acylcyclohexane-1,3-diones alkoximes

Abstract2-(1-Alkoxyiminoalkyl)cyclohexane-1,3-diones undergo at heating Beckmann rearrangement to give 6,7-dihydro-1,3-benzoxazol-4(5H)-one derivatives that under treatment with amines in acid medium are converted into 1,5,6,7-tetrahydro-4H-benzimidazol-4-ones. In reaction of 6,7-dihydro-1,3-benzoxazol-4(5H)-ones with O-ethylhydroxylamine 4-ethoxyimino derivatives were obtained that treated with hydrochloric acid formed the corresponding N-ethoxybenzimidazolones.

Heterocyclic analogs of prostaglandins: II. Synthesis of 10-oxaprostanoids with isoxazole and isoxazoline fragments in α-and ω-chain

By the use of “nitrile oxide procedure” from 3-alkyl(arylalkyl)-substituted 2,5-dihydro-2-furanones new 10-oxaprostanoids were prepared containing an isoxazole (isoxazoline) fragment in the α-or ω-prostanoid chain.

Tetrahydropyran-2,4-diones in the synthesis of fused N, O-heterocycles

Condensation of 6-methyl(or phenyl)-tetrahydropyran-2,4-diones with 2-aminonaphthalene or 6-aminoquinoline and aromatic aldehydes in an aliphatic alcohol gave 5-aryl-2,2-dimethyl(or 2-phenyl)-1,2,5,6-tetrahydro-4H-benzo[f]pyrano[3,4-c]quinolin-4-ones and 5-aryl-2-methyl-1,2,5,6-tetrahydro-4H-pyrano[4,3-a][4,7]phenanthrolin-4-ones which are new N,O-heterocyclic systems containing fused aza- and diazaphenanthrene moieties and a 2-pyranone ring.

REDUCTIVE TRANSFORMATIONS OF 3-ALKYL-AND 3-ARYL-5-(4-PYRIDYL)-2-ISOXAZOLINES

The reactions of 3-R-(4-pyridyl)-2-isoxazolines and the products of their hydrogenolysis over Raney Ni/AlCl3 with NaBH4 and KBH(s-Bu)3 as the reducing agents were studied. New polyhydroxyprostanoids were synthesized.

New 9,11-Ethano-7-oxo-13-thia Prostanoids

New 9,11-ethano analogs of prostaglandin endoperoxides containing a sulfur atom in position 13 were synthesized by nucleophilic addition of thiols at the polarized double bond of 2-acylbicyclo[2.2.1]hept-2-enes. Physicochemical properties and biological activity of the products were studied.

Reaction of 3,5-disubstituted 4,5-dihydroisoxazoles with hexacarbonylmolybdenum

Depending on the reaction conditions and structure of the 5-substituent, reactions of substituted 4,5-dihydroisoxazoles with hexacarbonylmolybdenum involve cleavage of the heteroring at the N-O bond, its aromatization, or/and 1,3-decyclization.