Synthesis of Fused Heterocycles Based on 1-Amino-1H-tetrazole-5-thiol and α,β-Unsaturated Aldehydes
摘要:
8-Phenyltetrazolo[5,1-b][1,3,4]thiadiazepine was obtained as a result of intermolecular cyclization of 1-amino-1H-tetrazole-5-thiol and 3-phenyl-2-propynal. The reaction of alpha-bromocinnamaldehyde with 1-amino-1H-tetrazole-5-thiol led to the formation of 7-benzylidene-7H-tetrazolo[5,1-b][1,3,4]thiadiazine. An effective method was developed for the synthesis of 1-[(3-phenylprop-2-yn-1-yl)amino]-1H-tetrazole-5-thiol, a key intermediate in the possible synthesis of 7-benzylidene-6,7-dihydro-5H-tetrazolo[5,1-b][1,3,4]thiadiazine.
Cephalosporins, process for their preparation, pharmaceutical compositions containing them and intermediates
申请人:BEECHAM GROUP PLC
公开号:EP0308559A3
公开(公告)日:1989-08-30
β-Lactam antibiotics are disclosed which have the formula (IA) or are pharmaceutically acceptable salts or pharmaceutically acceptable invivo hydrolysable esters thereof:
wherein Y is a 1-(optionally substituted amino)-1H-tetrazol-5-yl, 4-(optionally substituted amino)-1,2,4-triazol-3-yl, or 2-(optionally substituted amino)-1,3,4-thiadiazol-5-yl group; R¹ is phenyl, substituted phenyl, cyclohexenyl, cyclohexadienyl, or an optionally substituted 5- or 6- membered heterocyclic ring containing up to three hetero atoms selected from oxygen, nitrogen and sulphur; and R² is C₁₋₈ alkyl; and also the use thereof.Processes for the preparation of the compounds are disclosed together with intermediates for use therein.
Endo- and exocyclic N-alkylation of 1- and 5-aminotetrazoles with t-BuOH–HClO4: synthesis of mono-, di-, and tri-tert-butyl substituted aminotetrazolium salts
作者:Sergei V. Voitekhovich、Pavel N. Gaponik、Alexander S. Lyakhov、Oleg A. Ivashkevich
DOI:10.1016/j.tet.2008.06.095
日期:2008.9
A new method for the synthesis of 1,3,5-trisubstituted aminotetrazolium salts based on alkylation of 1- and 5-aminotetrazoles with the t-BuOH–HClO4 system is presented. Depending on the structure of the tetrazole substrate and reaction conditions, alkylation proceeds at the endocyclic nitrogen atoms as well as at the 1- and 5-amino groups giving mono-, di-, and tri-tert-butyl substituted tetrazolium
Six novel 2-substituted pyrimido[5,4-e]tetrazolo[5,1-b][1,3,4]thiadiazines were prepared via a multistep synthetic sequence beginning with 5-bromo-2,4-dichloro-6-methylpyrimidine.
Chloroacetylenephosphonates in reactions with tetrazolethiones
作者:A. V. Dogadina、E. B. Erkhitueva、B. I. Ionin
DOI:10.1007/s11172-014-0497-7
日期:2014.3
Chloroacetylenephosphonates react with 1-substituted tetrazole-5-thiones in anhydrous acetonitrile to form fused heterocycles, viz., 3-substituted 6-(dialkoxyphosphoryl)-3H-thiazolo[3,2-d]tetrazol-7-ium chlorides, along with a small amount of compounds having a linear structure, viz., Z-dialkyl 1,2-bis[(1-methyl(phenyl)-1H-tetrazol-5-yl)sulfanyl]ethenyl}phosphonates.
1H-tetrazole-5-thiols and 4-substituted 4 H-1,2,4-triazole-3-thiols with alkyl halides or sulfonates lead to the formation of S-alkylated products regardless of the substituent on the heterocycle. In this work, we found that substituted 1H-tetrazole-5-thiols and 4 H-1,2,4-triazole-3-thiols readily reacted with vinyl ethers in the absence of a catalyst to exclusively form N-substituted 1H-tetrazole-5(4H)-thiones and
与取代基烷基无关的1-取代的1 H-四唑-5-硫醇和4-取代的4 H-1,2,4-三唑-3-硫醇的烷基化导致形成S-烷基化产物在杂环上。在这项工作中,我们发现在没有催化剂的情况下,取代的1 H-四唑-5-硫醇和4 H-1,2,4-三唑-3-硫醇易于与乙烯基醚反应,专门形成N-取代的1 H -四唑-5(4 H)-硫酮和1 H -1,2,4-三唑-5(4 H)-硫酮。此外,5-取代-1 H的反应在相同条件下用乙烯基醚合成-四唑,有选择地产生2,5-二取代的四唑。