- Synthesis of enantiopure α-Tfm-proline and α-Tfm-pipecolic acid from oxazolo-pyrrolidines and -piperidines
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Enantiopure α-Tfm-proline and α-Tfm-pipecolic acid were synthesized starting from commercially available diesters and ethyl trifluoroacetate. A Strecker type reaction on intermediate chiral Tfm-oxazolo-pyrrolidine and -piperidine provided the corresponding nitrile precursor of enantiopure (R) and (S) α-Tfm-proline and α-Tfm-pipecolic acid. The C-terminal peptide coupling reaction of α-Tfm-pipecolic acid has been successfully achieved.
- Bordessa, Andrea,Brigaud, Thierry,Chelain, Evelyne,Diarra, Sitan,Gadais, Charlène,Lensen, Nathalie,Sanchez, Clément A.
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p. 6771 - 6775
(2021/08/20)
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- From a Designer Drug to the Discovery of Selective Cannabinoid Type 2 Receptor Agonists with Favorable Pharmacokinetic Profiles for the Treatment of Systemic Sclerosis
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Synthetic cannabinoids, as exemplified by SDB-001 (1), bind to both CB1 and CB2 receptors and exert cannabimimetic effects similar to (-)-trans-Δ9-tetrahydrocannabinol, the main psychoactive component present in the cannabis plant. As CB1 receptor ligands were found to have severe adverse psychiatric effects, increased attention was turned to exploiting the potential therapeutic value of the CB2 receptor. In our efforts to discover novel and selective CB2 receptor agonists, 1 was selected as a starting point for hit molecule identification and a class of 1H-pyrazole-3-carboxamide derivatives were thus designed, synthesized, and biologically evaluated. Systematic structure-activity relationship investigations resulted in the identification of the most promising compound 66 as a selective CB2 receptor agonist with favorable pharmacokinetic profiles. Especially, 66 treatment significantly attenuated dermal inflammation and fibrosis in a bleomycin-induced mouse model of systemic sclerosis, supporting that CB2 receptor agonists might serve as potential therapeutics for treating systemic sclerosis.
- Jiang, Bei-Er,Jiang, Xingwu,Zhang, Qiansen,Liang, Qiuwen,Qiu, Zi-Liang,Sun, Xiang-Bai,Yang, Jun-Jie,Chen, Si,Yi, Chunyang,Chai, Xiaolei,Liu, Mingyao,Yu, Li-Fang,Lu, Weiqiang,Zhang, Han-Kun
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p. 385 - 403
(2021/02/05)
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- (2R,1'S,2'R)- And (2S,1'S,2'R)-3-[2-mono(di,tri)fluoromethylcyclopropyl] alanines and their incorporation into hormaomycin analogues
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Efficient and scalable syntheses of enantiomerically pure (2 R ,1' S ,2' R )- and (2 S ,1' S ,2' R )-3-[2-mono(di,tri)fluoromethylcyclopropyl] alanines 9a - c , as well as allo-D-threonine ( 4 ) and ( 2 S,3R)-β-methylphenylalanine (3), using the Belokon' approach with (S )- and (R )-2-[( N-benzylprolyl)amino]benzophenone [(S)- and (R)-10 ] as reusable chiral auxiliaries have been developed. Three new fluoromethyl analogues of the naturally occurring octadepsipeptide hormaomycin ( 1 ) with (fluoromethylcyclopropyl) alanine moieties have been synthesized and subjected to preliminary tests of their antibiotic activity.
- De Meijere, Armin,Kozhushkov, Sergei I.,Yufit, Dmitrii S.,Grosse, Christian,Kaiser, Marcel,Raev, Vitaly A.
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p. 2844 - 2857
(2015/02/19)
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- Concise synthesis of ω-fluoroalkylated ketoesters. A building block for the synthesis of six-, seven-, and eight-membered fluoroalkyl substituted 1,2-diaza-3-one heterocycles
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A concise and general synthetic route toward the small and medium-sized fluoroalkyl substituted 1,2-diaza-3-one heterocyclic ring skeletons via a sequential reaction of condensation and ring-closure reaction of ω-fluoroalkylated ketoesters 4 with hydrazin
- Wan, Wen,Hou, Jie,Jiang, Haizhen,Wang, Yangli,Zhu, Shizheng,Deng, Hongmei,Hao, Jian
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experimental part
p. 4212 - 4219
(2009/09/30)
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- INDOLYLMALEIMIDE DERIVATIVES
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A compound of formula (I) wherein R denotes another heterocylic residue and wherein Ra, Rb, Rc, Rd and Re, are as defined in the specification, processes for their production, their uses, in particular in transplantation, and pharmaceutical compositions containing them.
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Page/Page column 32-33
(2008/12/06)
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- Acylated amine compounds which are useful fungicigal agents
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A compound selected from the group consisting of a compound of the formula STR1 wherein R1 is selected from the group consisting of Ar-O- and aryl, polyaryl and condensed polyaryl unsubstituted or substituted and heterocycle unsubstituted or substituted, Ar is aryl of 6 to 14 carbon atoms unsubstituted or substituted, heteroaryl unsubstituted or substituted and heterocyclic unsubstituted or substituted, W is selected from the group comsisting of --(CH2)n1 --or --(CH2)n2 --NY--(CH2)n3, n1, n2 and n3 are individually integers from 2 to 6, Y is selected from the group consisting of hydrogen, alkyl of 1 to 12 carbon atoms, aryl of 6 to 12 carbon atoms and aralkyl of 7 to 14 carbon atoms unsubstituted or substituted, --COOAlk and --COR2, Alk is alkyl of 1 to 12 carbon atoms, R2 is selected from the group consisting of alkyl of 1 to 12 carbon atoms, alkenyl and alkynyl of 2 to 12 carbon atoms, aryl of 6 to 14 carbon atoms, aralkyl of 7 to 18 carbon atoms unsubstituted or substituted and heterocyclic unsubstituted or substituted, Z is selected from the group consisting of hydrogen, STR2 R2 is alkyl of 1 to 12 carbon atoms or aralkyl of 7 to 18 carbon atoms, Alk' is alkyl of 1 to 12 carbon atoms, ArAlk is aralkyl of 7 to 18 carbon atoms, R2 ' is R2, R3 and R3 ' are selected from the group consisting of aryl substituted or unsubstituted, heteroaryl substituted or unsubstituted, heterocyclic unsubstituted or substituted and R1 with the proviso that Z is not hydrogen when W is --(CH2)3 --and R1 is 2,4-dichlorophenoxy and their non-toxic, pharmaceutically acceptable acid addition salts having fungicidal activity.
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- Regioselectivity in the Ring Opening of 2-Alkylcyclopropylmethyl Radicals: the Effect of Electronegative Substituents
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The regioselectivity of the ring-opening of the trans-2-alkylcyclopropylmethyl radical A to give the primary alkyl radicals B, or the secondary alkyl radicals C, has been investigated, where the groups R and/or CXY carry electronegative substituents.All these reactions gave principally the secondary alkyl radicals C, whereas, in the absence of electronegative substituents, ring-opening occurs in favour of the primary alkyl radicals B.This regioselectivity is interpreted in terms of the frontier orbital interactions which are involved.
- Ratier, Max,Pereyre, Michel,Davies, Alwyn G.,Sutcliffe, Roger
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p. 1907 - 1916
(2007/10/02)
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- UMWANDLUNG VON α-AMINOSAEUREN IN α-DIKETONE UEBER OXAZOLINZWISCHENSTUFEN
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A four step sequence for the conversion of α-amino acids into α-diketones under mild conditions is desribed.
- Leyendecker, Joachim,Niewoehner, Ulrich,Steglich, Wolfgang
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p. 2375 - 2378
(2007/10/02)
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