Synthesis of C-nucleosides from non-carbohydrate precursors. A 2,4-dioxoimidazolidin-5-yl ribofuranoside
作者:Akira Sera、Kuniaki Itoh、Hiroshi Yamaguchi
DOI:10.1016/s0040-4039(00)97113-2
日期:1990.1
3-Phenyl-2,4-dioxoimidazolidin-5-yl ribofuranoside (a hydantoin C-riboside) was synthesized from a Diels-Alder adduct of furan with methyl nitroacrylate.
作者:Linda L. Chang、Quang Truong、George A. Doss、Malcolm MacCoss、Kathryn Lyons、Ermengilda McCauley、Richard Mumford、Gail Forrest、Stella Vincent、John A. Schmidt、William K. Hagmann
DOI:10.1016/j.bmcl.2006.11.011
日期:2007.2
VLA-4 is implicated in several inflammatory and autoimmune disease states. A series of cyclic P-amino acids (beta-aa) was studied as VLA-4 antagonists. Binding affinity was highly dependent on the dihedral angle (phi) between the amino and the carboxyl termini of the beta-aa. Compound 5m where the beta-aa is embedded in a bicycle possesses the most preferred phi (120 degrees). It is a potent and bioavailable VLA-4 antagonist (VCAM-Ig alpha 4 beta 1 IC50 = 54 nM, rat po F = 49%). (c) 2006 Elsevier Ltd. All rights reserved.
Time Dependent Interconversion of Diels-Alder Adducts into Michael Adducts
作者:Kuniaki Itoh、Kazue Kitoh、Akira Sera
DOI:10.3987/com-98-8398
日期:——
Furans react with methyl 3-nitroacrylate to concurrently give Diels-Alder adducts and Michael adducts, and the former turns into the latter. The orbital energy difference between a HOMOdiene and a LUMOdienophile seems to control the product distribution of the reaction.