G. R. Mingaleeva

Synthesis of macrolides containing an azine or hydrazide fragment via successive tishchenko disproportionation and [1 + 1]-condensation

Eight potentially useful 15-, 17-, 20-, and 22–25-membered macrolides having an azine or hydrazide fragment were synthesized starting from L-menthol, tetrahydropyran, and 4-methyltetrahydropyran via [1 + 1]-condensation of hydrazine hydrate and some dicarboxylic dihydrazides with 7-oxooctyl 7-oxooctanoate, 3-methyl-7-oxooctyl 3-methyl-7-oxooctanoate, and (3R)-3,7-dimethyl-6-oxooctyl (3R)-3,7-dimethyl-6-oxooctanoate obtained by the Tishchenko reaction from 7-oxo-, 3-methyl-7-oxo, and (3R)-3,7-dimethyl-6-oxooctanals, respectively.

Synthesis of optically active macrolides with hydrazide fragments from tetrahydropyran and L-(+)-tartaric acid derivatives

The synthesis of two potentially useful optically active 23- and 30-membered macrolides containing a 1,2-diol system and dihydrazide fragments was developed starting from tetrahydropyran. It was based on [1+1]-condensation of 7-oxooctyl-7-oxooctanoate and bis(7-oxooctyl)hexanedioate with L-(+)-tartaric acid hydrazide.

Synthesis of macrocyclic azino and dihydrazido diesters by consecutive [2 + 1]- and [1 + 1]-condensations

Efficient procedures for the synthesis of 21–24- and 28–31-membered macrocyclic azino diesters and dihydrazido diesters were developed starting from L-menthol, Δ3-carene, (+)-α-pinene, tetrahydropyran, and 4-methyltetrahydropyran. The key steps in these syntheses were consecutive [2 + 1]- and [1 + 1]-condensations. The 31-membered dihydrazido diester exhibited strong antibacterial activity.

Synthesis of macrolides with N-containing (azine or hydrazide) groups

Potentially useful 17-, and 22÷25-membered macrolides containing azine or hydrazide groups were synthesized from tetrahydropyran via [1+1]-condensation at room temperature of 7-oxooctyl-7-oxooctanoate, which was obtained via Tishchenko reaction from 7-oxooctanal, with hydrazine hydrate and hydrazides of several dicarboxylic acids.

Synthesis of Optically Active Macrolides From L-Menthone Derivatives and Hydrazides of Adipic and 2,6-Pyridinedicarboxylic Acids

Efficient syntheses of two potentially useful optically active macroheterocycles with esters and dihydrazides of 2,6-pyridinedicarboxylic and adipic acids starting from available natural L-menthol and passing through intermediate 8-hydroxy-2,6R-dimethyloctan-3-one were developed. The key steps were [2 + 1]-reaction of the last with 2,6-pyridinedicarboxylic acid chloride and [1 + 1]-condensation of the resulting α,ω-diketodiester with 2,6-pyridinedicarboxylic- and adipic-acid dihydrazides. The structures were confirmed using IR and NMR spectroscopy and LC-MS.

Synthesis of enantiomerically pure macrolides with hydrazide fragments from tetrahydropyran and l-(+)-tartaric acid derivatives

A synthesis of two potentially useful bicyclic 26- and 33-membered macrolides containing 1,3-dioxolane and hydrazide fragments was developed starting from tetrahydropyran via a [1+1]-condensation of 7′-oxooctyl-7-oxooctanoate and bis(7-oxooctyl)hexanedioate with hydrazide of L-(+)-tartaric acid acetonide derivative.

Synthesis from l-menthol of optically active macroheterocycles containing ester, azine, or hydrazide groups

A synthesis of optically pure methyl- and isopropyl-branched 21-, 22-, 28-, and 29-membered azinodiesters and diesterdihydrazides from l-menthol using [2 + 1]-condensation of (6R)-8-hydroxy-2,6-dimethyloctan3-one and glutaric and adipic acid chlorides and [1 + 1]-reaction of the intermediate diketodiesters with hydrazine hydrate and glutaric acid dihydrazide was developed.

Synthesis of symmetric macrocyclic diesterdihyrazides using successive [2+1]- and [1+1]-condensations

Potentially useful symmetric macrocyclic diesterdihydrazides were synthesized efficiently from available petrochemical products (tetrahydropyran and 4-methyltetrahydropyran) using successive [2+1]-condensation of 8-hydroxyoctan-2-one and its 6-methyl derivative with glutaric and adipic chlorides and [1+1]-condensation of the intermediate diketodiesters with glutaric dihydrazide.

Synthesis from L-menthol of optically active macrolides with N-containing (azine or hydrazide) groups

Potentially useful 15- and 20-membered macrolides containing azine or hydrazide groups were synthesized from L-menthol via [1+1]-condensation at room temperature of 3R,7-dimethyl-6-oxooctyl-3R,7-dimethyl-6-oxooctanoate, which was obtained from 3R,7-dimethyl-6-oxooctanal via a Tishchenko reaction, with hydrazine hydrate or malonic acid dihydrazide.

Synthesis of Optically Active Macrolides from L-menthol

Effective syntheses of three optically active macroheterocycles with ester, azine, and dihydrazide fragments were developed from available natural L-menthol through intermediate 3R,7-dimethyl-6-oxooctanoic acid using [2 + 1]-reaction of the last with diethylene glycol and [1 + 1]-condensation of the resulting α,ω-diketodiester with hydrazine hydrate and dihydrazides of several dicarboxylic acids in the key steps. The structures of the synthesized compounds were confirmed using IR and NMR spectroscopy and GC-MS.