- Discovery of an 8-aza-5-thiaProstaglandin E1 analog as a highly selective EP4 receptor agonist
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For the purpose of discovering an orally available EP4 subtype-selective agonist, a series of 8-aza prostaglandin E1 (PGE1) analogs were synthesized and evaluated for their affinity for PGE2 receptor subtypes. Additionally
- Kambe, Tohru,Maruyama, Toru,Naganawa, Atsushi,Asada, Masaki,Seki, Akiteru,Maruyama, Takayuki,Nakai, Hisao,Toda, Masaaki
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p. 1494 - 1508
(2012/01/13)
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- Expeditious syntheses of sugar-modified nucleosides and collections thereof exploiting furan-, pyrrole-, and thiophene-based siloxy dienes
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A series of individual sugar-modified pyrimidine nucleosides including enantiomerically enriched 2',3'-dideoxynucleosides 14a-c (α and β anomers of L- and D-series), 2',3'-dideoxy-4'-thionucleosides 21a-c (α and β anomers of L- and D-series), and 2',3'-dideoxy-4'-azanucleosides 28a-c (β anomers of L- and D-series) were synthesized, with uniform chemistry and high stereochemical efficiency, exploiting a triad of versatile heterocyclic siloxy dienes, namely, 2-(tert-butyldimethylsiloxy)furan (TBSOF), 2-(tert- butyldimethylsiloxy)thiophene (TBSOT), and N-(tert-butoxycarbonyl)-2-(tert- butyldimethylsiloxy)pyrrole (TBSOP). The synthetic procedure advantageously used both enantiomers of glyceraldehyde acetonide (D-1 and L-1) as sources of chirality and as synthetic equivalents of the formyl cation. The outlined chemistry also allowed for the rapid assemblage of a 30-member collection of racemic nucleosides (D,L-L) as well as one 15-member ensemble of chiral analogues (L-L), along with some related sublibraries.
- Rassu, Gloria,Zanardi, Franca,Battistini, Lucia,Gaetani, Enrico,Casiraghi, Giovanni
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p. 168 - 180
(2007/10/03)
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- Total syntheses of N-boc-protected 3′-deoxy-4′-azathymidine and 4′-azauridine
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Novel modified nucleosides 4, 11, ent-11, and 17, wherein the furanose ring oxygen is replaced by nitrogen, have been synthesized by reacting azasugars 3, 10, ent-10, and 15 with silylated uracil or thymine bases.
- Rassu, Gloria,Pinna, Luigi,Spanu, Pietro,Ulgheri, Fausta,Casiraghi, Giovanni
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p. 4019 - 4022
(2007/10/02)
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- 12. Approaches to the Synthesis of Cytochalasans; Part 9: A Versatile Concept Leading To All Structural Types of Cytochalasans
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Starting from D-glutamic acid (5), the bicyclic compounds 4a and 4b were synthesized via 17 (Schemes 1 and 2).The reaction leading to 4g and 4h with LiCuPh2 was not successful.But treatment of the N-protected model lactams 19, 21, and 22 with Li2Cu(CN)Ph2 gave the amino ketones 24, 26, and 26, respectively (Scheme 3).The desired compound 23 was obtained from 20.Conversion of the unprotected lactams 28, 31, and 32 gave the phenyl derivative 34 in excellent yields.Ester 35 was transformed to the α-amino-γ-oxo-acid derivative 36.This conversion opens a novel access to this type of compounds.
- Ackermann, Jean,Matthes, Michael,Tamm, Christoph
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p. 122 - 132
(2007/10/02)
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