Hydrolysis of Bis[5,5-dimethyl-3-(4-oxa-1-azoniacyclohexylidene)-1-cyclohexenyl] Sulfide Diperchlorate

Hydrolysis of bis[5,5-dimethyl-3-(4-oxa-1-azoniacyclohexylidene)-1-cyclohexenyl] sulfide diperchlorate, as well as of bis(5,5-dimethyl-3-thioxo-1-cyclohexenyl) sulfide, in the system MeCN-Et₃N yields a mixture of bis(5,5-dimethyl-3-oxo-1-cyclohexenyl) sulfide and isomeric 5,5-dimethyl-3-oxo-1-cyclohexenyl 3,3-dimethyl-5-oxo-1-cyclohexenyl sulfide. The structure of the products and their ratio were established by ¹H and ¹³C NMR and IR spectroscopy.     

Reaction of α,β-unsaturated carbodiimides with enamines leading to fused pyridine derivatives

The treatment of (5,5-dimethyl-3-oxo-1-cyclohexenyl)iminotriphenylphosphorane ( 2 ) with phenyl isocyanate ( 3a ) gave N-(5,5-dimethyl-3-oxo-1-cyclohexenyl)-N'-phenylcarbodiimide ( 4a ) in situ. The reaction of 4a with enamines proceeded smoothly to afford the pyridine ring formation with the elimination of amine. This means that 4a is regarded as a new class of 2-aza-1,3-butadiene. The scopes and limitation of this reaction are also discussed.     

Hydrothiolysis of carbofunctional α,β-unsaturated sulfides as an approach to the synthesis of 1,7-dithiocarbonyl compounds

Bis(1-N,N-dimethylimmonio-3-phenylprop-2-en-3-yl) sulfide diperchlorate and (1-N,N-dimethyl-immonio-3-phenylprop-2-en-3-yl) (5,5-dimethyl-1-morpholiniocyclohex-2-en-3-yl) sulfide diperchlorate react with hydrogen sulfide giving rise to the corresponding 1,7-thioxoimmonio sulfides. Treating with the hydrogen sulfide (1-N,N-dimethylimmonio-3-phenylprop-2-en-3-yl) (1-oxo-2-phenyl-inden-3-yl) sulfide perchlorate led to preparation of (1-oxo-2-phenylinden-3-yl) (1-thioxo-3-phenylprop-2-en-3-yl) sulfide. The hydrothiolysis of (5,5-dimethyl-1-morpholiniocyclohex-2-en-3-yl) (1-N,N-dimethylimmonio-2-phenylinden-3-yl) sulfide diperchlorate and (5,5-dimethyl-1-morpholiniocyclohex-2-en-3-yl) (1-oxo-2-phenylinden-3-yl) sulfidea perchlorate resulted in products of the sulfide bond cleavage in the initial immonium salts.     

Steric Structure of Bis(5,5-dimethyl-3-thioxo-1-cyclohexenyl) Sulfide

Two-dimensional NMR spectroscopy, dipole moment measurements, and quantum-chemical calculations (basis 6-31G^*) were used to show that in the gas phase and in solutions bis(5,5-dimethyl-3-thioxo-1-cyclohexenyl) sulfide prefers a nonplanar cis-trans conformation.     

1,7-Dithioxo systems. Reaction of bis(5,5-dimethyl-3-thioxo-cyclohex-1-en-1-yl) sulfide with amines

Reactions of amines (N,N-dimethylethane-1,2-diamine, benzylamine, aniline) with bis(5,5-dimethyl-3-thioxocyclohex-1-en-1-yl) sulfide result in cleavage of the sulfide bond and formation of the corresponding 3-amino-5,5-dimethylcyclohex-2-ene-1-thiones. Aminolysis of bis(5,5-dimethyl-3-oxocyclohex-1-en-1-yl) sulfide occurs at the carbonyl groups with conservation of the divinyl sulfide fragment.     

1,7-Dithioxo systems. Photochemical, thermal, and chemical stabilities of bis(5,5-dimethyl-3-thioxo-1-cyclohexenyl) sulfide

Photochemical, thermal, and chemical stabilities of bis(5,5-dimethyl-3-thioxo-1-cyclohexenyl) sulfide in crystal and in solution were studied.Translated from Zhurnal Obshchei Khimii, Vol. 74, No. 10, 2004, pp. 1692–1694.Original Russian Text Copyright © 2004 by Timokhina, Panova, Kanitskaya, Sokolnikova, Voronkov.This revised version was published online in April 2005 with a corrected cover date.     

Reaction of alkyl 5,5-dimethyl-2-oxo-2,5-dihydrofuran-3-carboxylates with zinc enolates prepared from zinc and 1-arul-2-bromo-2-phenylethanones, 2 bromoindanone, and 2-bromo-6-methyltetralone

Alkyl 5,5-dimethyl-2-oxo-2,5-dihydrofuran-3-carboxylates react with zinc enolates prepared from 1-aryl-2-bromo-2-phenylethanones, 2-bromo indanone, 2-bromo-6-methyltetralone and zinc with formation of ethyl 4-(2-aryl-2-oxo-1-phenyl-ethyl)-5,5-dimethyl-2-oxotetrahydrofuran-3-carboxylates, alkyl 5,5-dimethyl-2-oxo-4-(1-oxoindan-2-yl)tetrahydrofuran-3-carboxylates, and ethyl 5,5-dimethyl-4-(6-methyl-1-oxo-1,2,3,4-tetrahydronaphthalen-2-yl)-2-oxotetrahydrofuran-3-carboxylates respectively, mainly as single diastereomers.     

1,7-dithioxo systems. Reaction of 3-[(5,5-dimethyl-3-thioxocyclohex-1-en-1yl)sulfanyl]-5,5-dimethylcyclohex-2-ene-1-thione with 2-aminoethanol and ethane-1,2-diamine

The reaction of 3-[(5,5-dimethyl-3-thioxocyclohex-1-en-1-yl)sulfanyl]-5,5-dimethylcyclohex-2-ene-1-thione with 2-aminoethanol involves cleavage of the sulfide bond with formation of 3-[(2-hydroxyethyl)-amino]-5,5-dimethylcyclohex-2-ene-1-thione as the major product. The reaction of the same sulfide with ethane-1,2-diamine gave previously unknown 3-({2-[(5,5-dimethyl-3-thioxocyclohex-1-en-1-yl)amino]ethyl}-amino)-5,5-dimethylcyclohex-2-ene-1-thione.     

Synthesis of 4,6-diaryl-1-benzyl-6-hydroxy-5,5-dimethyl-2-oxopiperidine-3-carbonitriles and their analogs via a modified Reformatsky reaction

Organozinc compounds obtained from 1-aryl-2-bromo-2-methylpropanone and zinc react with N-benzyl-3-aryl-2-cyanoacrylamides or N-[6-(2-cyano-1-oxo-3-phenylprop-2-enylamino)hexyl]-2-cyano-3-phenylacrylamide to give 4,6-diaryl-1-benzyl-6-hydroxy-5,5-dimethyl-2-oxopiperidine-3-carbonitriles or 1,6-bis(6-aryl-3-cyano-6-hydroxy-5,5-dimethyl-2-oxo-4-phenylpiperidyl)hexanes as a single isomer with trans-located piperidine hydrogen atoms.     

Studies on organophosphorus compounds—XXVII: Synthesis of thiono-, thiolo- and dithiolactones

Unsubstituted and alkyl- or cyanosubstituted lactones such as dihydro-2(3 H)-furanone, dihydro-5-methyl-2(3 H)-furanone, dihydro-5,5-dimethyl-4-propyl-2(3 H)-furanone and tetrahydro-2,2-dimethyl-5-oxo-3furan-carbonitrile react with the dimer of p-methoxyphenylthionophosphine sulfide, 1, in anhydrous xylene or toluene to give the corresponding thionolactones, 3a-d, in good yields. Dihydro-2(3 H)-thiophenone and 1 produce dihydro-2(3 H)-thiophenthione. Aromatic lactones such as 2 H-1-benzopyran-2-one give the corresponding 2-thione. 1-Oxa-4-thiaspiro[4,5]decan-2-one, when treated with 1 at 120-125°, gave 1,4-dithiaspiro[4,5]decan-2-one and 1,4-dithias-piro[4,5]decan-2-thione. Tetrahydro-5,5-dimethyl-2-oxo-4-propyl-3-furancarboxylic acid ethyl ester reacted with 1 at 110° giving the corresponding 2-thione and 5,5-dimethyl-4-propyl-4,5-dihydrothieno[2,3-c]-1,2-dithiole-3-thione.     

水溶剂中芳醛与5，5－二甲基－1，3－环己二酮的反应

芳醛1与5，5－二甲基－1，3－环己二酮（2）在氯化三乙基苄基铵（TEBA）催 化下在水中生成2，2'－芳业甲基双（3－羟基－5，5－二甲基－2－环己烯－1－酮 ）（3），若在体系中有对甲苯磺酸存在时则生成3，3，6，6－四甲基－9－芳基－ 1，8－二氧代八氢化氧杂蒽（4）或3，3－二甲基－9－（3－羟基－5，5－二甲基 －2－环己烯－1－酮－2－基）－1－氧代四氢代氧杂蒽（6）而不是生成3，产率接 近定量。     

Reactions of dialkyl 4-bromo-2,2-dimethyl-3-oxohexane-1,6-dioates,-heptane-1,7-dioates with zinc and aromatic aldehydes

Zinc enolates generated from dimethyl 4-bromo-2,2-dimethyl-3-oxohexane-1,6-dioate and zinc reacted with aromatic aldehydes giving methyl 2,2-dimethyl-3-oxo-3-(5-oxo-2-aryltetrahydrofuran-3-yl)propanoates. The reaction of zinc enolates obtained from dimethyl 4-bromo-2,2-dimethyl-3-oxoheptane-1,7-dioate and zinc with aromatic aldehydes depending on the synthesis conditions led to the formation either methyl 2,2-dimethyl-3-oxo-3-(6-oxo-2-aryltetrahydropyran-3-yl)propanoates or 3-(5,5-dimethyl-4,6-dioxo-2-aryltetrahydropyran-3-yl)propanoates. The compounds synthesized formed as a single diastereomer of E-configuration.     

微波辐射下4-芳基-7,7-二甲基-5-氧代-3,4,5,6,7,8-六氢 香豆素的合成及其晶 体结构

芳醛(1),5,5-二甲基-1,3-环已二酮(2),麦氏酸(3)经微波辐射3～5min,不需任何催化剂,得到4-芳基-7,7-二甲基-5-氧代-3,4,5,6,7,8-六氢香豆素(4)。产物的结构经红外、核磁、元素分析及X-射线衍射法确证。对反应过程提出了可能的机理。     

无外加催化剂条件下芳香醛与活性亚甲基化合物的缩合反应和迈克尔加成反应

在DMF溶剂中，不外加催化剂使芳香醛(1)与2,2-二甲基-1,3-二氧六环-4,6-二酮(2)发生缩合反应生成2,2-二甲基-5-芳亚甲基-1,3-二氧六环-4,6-二酮(3a～f)。在同样条件下，芳香醛与5,5-二甲基-1,3-环己二酮(4)则发生缩合和迈克尔加成反应生成2,2'-芳亚甲基双(3-羟基5,5-二甲基-2-环己烯-1-酮)(5a～h)。用单晶X-射线分析法确定了产物5b的晶体结构。     

1,7-Dithioxo-substituted systems. Bis(5,5-dimethyl-3-thioxocyclohex-1-enyl) sulfide in reactions with metals

The transformations of bis(5,5-dimethyl-3-thioxocyclohex-1-enyl) sulfide in the presence of activated copper and zinc powders are studied. The products obtained are analyzed by quantitative ¹³C NMR spectroscopy.     

Syntheses with organoboranes. XI. Allylboration Of vinylic epoxides with allylic dialkylboranes

Allylboration of representative vinylic epoxides with allyldiethylborane (1) and (2-cyclohexenyl)dicyclohexylborane (2) affords the corresponding 1,2- and 1,4-addition products. cis-1, 2-Addition is favored in the reaction of 1 with 3, 4-epoxycycloalkenes of six- to eight-membered rings. 3, 4-Epoxycyclopentene (3a) and 5,5-dimethyl-3,4-epoxycyclopentene (3b) undergo five-membered ring opening during allylboration with 1 and 2, producing the corresponding (Z)-trienols (4a and 4b) with high stereoselectivity. 1,4-Addition of 1 and 2 to monoepoxides of 1, 3-butadiene and isoprene is favored, producing predominantly the corresponding (E)-alcohols.     

1- and 2-(4-Hydroxycarbonylphenyl)-4-oxo-4,5,6,7-tetrahydroindazoles

Reactions of 4-hydrazinobenzoic acid with 2-formyl- and 2-acetyldimedones were utilized to synthesize 6,6-dimethyl- and 3,6,6-trimethyl-1-(4-hydroxycarbonylphenyl)-4-oxo-4,5,6,7-tetrahydroindazoles corre-spondingly, and the reaction with 2-cyano-3-ethoxy-5,5-dimethylcyclohex-2-en-1-one gave 2-(4-hydroxy-carbonylphenyl)-3-amino-4-oxo-6,6-dimethyl-4,5,6,7-tetrahydroindazole. Riga Technical University, Riga LV-1658. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 516–519, April, 1997.     

水介质中2-氨基-4-芳基-7,7-二甲基-5-氧代-4H-5,6,7,8-四氢苯并[b]吡喃-3-羧酸酯的有效合成

水介质中在三乙基苄基氯化铵(TEBA)存在下, 芳亚甲基氰乙酸酯与5,5-二甲基-1,3-环己二酮反应为2-氨基-4-芳基-7,7-二甲基-5-氧代-4H-5,6,7,8-四氢苯并[b]吡喃-3-羧酸酯提供了一种快速、方便、高效和洁净的合成方法. 产物的结构通过红外光谱、核磁共振氢谱、元素分析和单晶X射线衍射确定.     

Synthesis of 1,3-dioxolane derivatives

Chloral cyanomethylhemiacetal is converted to 2-trichloromethyl-4-imino-1,3-dioxolane under the influence of hydrogen chloride or pyridine. Acetone cyanohydrin reacts with chloral to give 2-trichloromethyl-4-imino-5,5-dimethyl-1,3-dioxolane, the hydrochloride of which in water gives 2-trichloromethyl-4-oxo-5,5-dimethyl-1,3-dioxolane.     

水中2-氨基-3-氰基-4-芳基-7，7-二甲基-5-氧代4H-5，6，7，8-四氢苯并[b]吡喃的洁净合成

在水溶剂中在三乙基苄基氯化铵（TEBA）存在下，取代肉桂腈与5，5-二甲基- 1，3-环已酮反应为2-氨基-3-氰基-4-芳基-7，7-二甲基-5-氧代-4H，5，6，7，8- 四氢苯并[b]吡喃提供了一种快速、方便、高效和洁净的合成方法。