报道了L-苏-γ-氟甲蝶呤(1t)和L-苏-γ-氟叶酸(3t)的立体有择合成。化合物1t和3t对从CCRF-CEM人白血病细胞中分离的叶酰聚-γ-谷氨酸合成酶没有底物活性,化合物1t在与甲氨蝶呤相似的水平上抑制人二氢叶酸还原酶。还报道了DL-3,3-二氟谷氨酸的合成(6)及其掺入DL-β,β-二氟叶酸(4)。与叶酸相比,化合物4作为人CCRF-CEM叶酰聚-γ-谷氨酸合成酶的底物更好(V / K =约高7倍)。因此,用4-氟谷氨酸和3,3-二氟谷氨酸代替甲氨蝶呤和叶酸的谷氨酸部分导致叶酸和抗叶酸具有改变的多谷氨酰化活性。
报道了L-苏-γ-氟甲蝶呤(1t)和L-苏-γ-氟叶酸(3t)的立体有择合成。化合物1t和3t对从CCRF-CEM人白血病细胞中分离的叶酰聚-γ-谷氨酸合成酶没有底物活性,化合物1t在与甲氨蝶呤相似的水平上抑制人二氢叶酸还原酶。还报道了DL-3,3-二氟谷氨酸的合成(6)及其掺入DL-β,β-二氟叶酸(4)。与叶酸相比,化合物4作为人CCRF-CEM叶酰聚-γ-谷氨酸合成酶的底物更好(V / K =约高7倍)。因此,用4-氟谷氨酸和3,3-二氟谷氨酸代替甲氨蝶呤和叶酸的谷氨酸部分导致叶酸和抗叶酸具有改变的多谷氨酰化活性。
.delta.,.epsilon.-Unsaturated .beta.,.beta.-Difluoro-.alpha.-keto Esters: Novel Synthesis and Utility as Precursors of .beta.,.beta.-Difluoro-.alpha.-amino Acids
作者:Guo-qiang Shi、Wei-ling Cai
DOI:10.1021/jo00125a013
日期:1995.10
Treatment of the hemiketals 6 formed from ethyl trifluoropyruvate and primary allylic alcohols with SOCl2 and pyridine readily afforded a number of alpha-chloro-beta,beta,beta-trifluorolactyl allyl ethers 2. Subsequent reductive dechlorofluorination from 2 led to the formation of allyl-substituted difluoroenol pyruvyl ethers 3 whose Claisen rearrangement provided a convenient access to a variety of delta,epsilon-unsaturated beta,beta-difluoro-alpha-keto esters 4. As further transformation, direct conversion of beta,beta-difluoro-alpha-keto esters to the corresponding beta,beta-difluoro-alpha-amino acids was achieved by reductive amination of the corresponding alpha-keto acids with NH3 . H2O/NaBH4. Furthermore, use of the prepared beta beta-difluoro-alpha-keto ester 4a as a common precursor of other structurally related beta,beta-difluoro-alpha-amino acids was demonstrated by the synthesis of beta,beta-difluoroproline (18) and beta,beta-difluoroglutamic acid (23) through synthetic elaboration of its inherent double bond.
The synthesis of DL-3,3-Difluoroglutamic acid from a 3-oxoprolinol derivative
作者:Barry P. Hart、James K. Coward
DOI:10.1016/s0040-4039(00)74045-7
日期:1993.7
DL-3,3-Difluoroglutamic acid was synthesized from a masked 3-hydroxyprolinol, 6-hydroxy-l-aza-3-oxabicyclo[3.3.0]octan-2-one, in eight steps. The described synthetic route expands the utility of fluoroproline derivatives as precursors of fluoroglutamic acids.
Synthesis and Biological Activity of Folic Acid and Methotrexate Analogues Containing <scp>l</scp>-<i>threo</i>-(2<i>S,</i>4<i>S</i>)-4-Fluoroglutamic Acid and <scp>dl</scp>-3,3-Difluoroglutamic Acid
作者:Barry P. Hart、William H. Haile、Nicholas J. Licato、Wanda E. Bolanowska、John J. McGuire、James K. Coward
DOI:10.1021/jm950515e
日期:1996.1.1
L-threo-gamma-fluorofolic acid (3t) are reported. Compounds 1t and 3t have no substrate activity with folylpoly-gamma-glutamate synthetase isolated from CCRF-CEM human leukemia cells, and compound 1t inhibits human dihydrofolate reductase at similar levels as methotrexate. The synthesis of DL-3,3-difluoroglutamic acid (6) and its incorporation into DL-beta,beta-difluorofolic acid (4) are also reported
报道了L-苏-γ-氟甲蝶呤(1t)和L-苏-γ-氟叶酸(3t)的立体有择合成。化合物1t和3t对从CCRF-CEM人白血病细胞中分离的叶酰聚-γ-谷氨酸合成酶没有底物活性,化合物1t在与甲氨蝶呤相似的水平上抑制人二氢叶酸还原酶。还报道了DL-3,3-二氟谷氨酸的合成(6)及其掺入DL-β,β-二氟叶酸(4)。与叶酸相比,化合物4作为人CCRF-CEM叶酰聚-γ-谷氨酸合成酶的底物更好(V / K =约高7倍)。因此,用4-氟谷氨酸和3,3-二氟谷氨酸代替甲氨蝶呤和叶酸的谷氨酸部分导致叶酸和抗叶酸具有改变的多谷氨酰化活性。