Hoseggen, Tom; Rise, Frode; Undheim, Kjell, Journal of the Chemical Society. Perkin transactions I, 1986, p. 849 - 850
作者:Hoseggen, Tom、Rise, Frode、Undheim, Kjell
DOI:——
日期:——
Rise, Frode; Romming, Christian; Undheim, Kjell, Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1985, vol. 39, # 6, p. 459 - 468
作者:Rise, Frode、Romming, Christian、Undheim, Kjell
DOI:——
日期:——
Stereoselective Synthesis of Alkynylglycines and alpha,alpha'-Alkynyl-Bridged Bis(glycines).
作者:Synne Rødbotten、Tore Benneche、Kjell Undheim、Antonin Lycka、Jose Maria Moreno、Antonio Romerosa、Ward T. Robinson、Björn O. Roos、Claire Vallance、Bryan R. Wood
DOI:10.3891/acta.chem.scand.51-0873
日期:——
Pd-CuI catalysis has been used to effect carbo-substitution with iodoarenes on the terminal alkynyl carbon in (2S,5R)-2,5-dihydro-3,6-dimethoxy-2-isopropyl-5-propargylpyrazine. Bridged structures were formed from diiodoarenes. Homocoupling with bridge formation between two alkynyl units was effected by the same catalyst system with air as the oxidant. Mild hydrolysis gave the corresponding unsaturated amino acids and esters. The dicoupled amino acids have two triple bonds in conjugation in the bridge between the alpha,alpha'-carbons in the two glycine units.
Sodium 2-Mercaptoethanesulfonate in Reversible Adduct Formation and Water Solubilization.
Sodium 2-mercaptoethanesulfonate (MESNA, coenzyme M) forms 1:1 covalent adducts with highly pi-electron deficient heterocycles. The addition is caused by the thiol function, and the adducts become water soluble as sulfonates. 1H NMR spectroscopy has been used to obtain information about electronic and steric effects on the equilibria between 2-pyrimidinones and their 1:1 MESNA adducts. The adducts are potential prodrugs for biologically interesting 2-pyrimidinones.