Regio- and stereoselective ring-opening of chiral 1,3-oxazolidin-2-one derivatives by organocopper reagents provides novel access to di-, tri- and tetra-substituted alkene dipeptide isosteresElectronic supplementary information (ESI) available: synthetic procedures and characterization for 4a,b, 5a,b, 7b, 8a,b, 9a,b, 10b, 11a,b, 12b,c, 13b, 14a,b, 15, 16a,b, 17a,b, 18, 19b, 20b. See http://www.rsc.org/suppdata/p1/b2/b203482d/
作者:Shinya Oishi、Ayumu Niida、Takae Kamano、Yoshihisa Miwa、Tooru Taga、Yoshihiko Odagaki、Nobuyuki Hamanaka、Mikio Yamamoto、Keiichi Ajito、Hirokazu Tamamura、Akira Otaka、Nobutaka Fujii
DOI:10.1039/b203482d
日期:2002.7.26
Organocopper-mediated alkylation of β-(
N-Boc-2-oxo-1,3-oxazolidin-5-yl)-α,β-enoates has been intensively investigated. Alkylation proceeded regio- and stereoselectively by
anti-
SN2′ ring-opening to provide a new route to the synthesis of
ψ[(
E)-CHCH]-,
ψ[(
E)-CMeCH]- and
ψ[(
E)-CMeCMe]- type alkene dipeptide isosteres from chiral amino acid derivatives. These resulting agents are potential mimetics of type II and type II′
β-turn substructure.
有机铜介导的β-(N-Boc-2-氧代-1,3-嗯唑烷-5-基)-α,β-烯酸酯的烷基化反应已被深入研究。通过反式-SN2'环开裂,烷基化反应在区域选择性和立体选择性上进行,为从手性氨基酸衍生物合成ψ[(E)-CHCH]-、ψ[(E)-CMeCH]-和ψ[(E)-CMeCMe]-型烯丙二肽类似物提供了一条新途径。这些合成的试剂是潜在的II型和II'型β-转角结构域模拟物。
Diastereoselective Synthesis of New <i>ψ</i>[(<i>E</i>)-CHCMe]- and <i>ψ</i>[(<i>Z</i>)-CHCMe]-type Alkene Dipeptide Isosteres by Organocopper Reagents and Application to Conformationally Restricted Cyclic RGD Peptidomimetics
作者:Shinya Oishi、Takae Kamano、Ayumu Niida、Yoshihiko Odagaki、Nobuyuki Hamanaka、Mikio Yamamoto、Keiichi Ajito、Hirokazu Tamamura、Akira Otaka、Nobutaka Fujii
DOI:10.1021/jo025923m
日期:2002.8.1
cis-conformers of D-Phe-L-MeVal, respectively, were utilized in a structure-activity relationship study on cyclic RGD peptides 1 and 2, in company with a psi[(E)-CH=CH]-type alkene dipeptide isostere, D-Phe-psi[(E)-CH=CH]-L-Val. The cyclic isostere-containing pseudopeptides 3, 4, and 40 were synthesized and biological activity against integrin alpha(V)beta(3) and alpha(IIb)beta(3) receptors were also evaluated.
描述了与具有一个N-甲基氨基酸的二肽相对应的新的psi [(E)-CH = CMe]-和psi [(Z)-CH = CMe]-型烯烃二肽等排体的非对映选择性合成及其在生物活性肽中的应用。在引入等排体的手性α-烷基的关键反应中,有机铜介导的β-甲基化γ-甲氧基-α-β-烯酸酯26a的烷基化作用提供了抗S(N)2的E和Z异构体产品以溶剂依赖的方式。得到的两个等位基因D-Phe-psi [(E)-CH = CMe] -L-Val 27a和D-Phe-psi [(Z)-CH = CMe] -L-Val 28b,分别对应于D-Phe-L-MeVal的顺式和顺式构象异构体分别与psi [(E)-CH = CH]型烯烃二肽一起用于环状RGD肽1和2的结构-活性关系研究等排物,D-Phe-psi [(E)-CH = CH] -L-Val。