Reference

Efficient oxidation of 2-mercaptopyridine catalyzed by heptylviologen and application to photosensitized carbon dioxide fixation

Efficient oxidation of 2-mercaptopyridine catalyzed by heptylviologen and application to photosensitized carbon dioxide fixation. Kodaka, Masato (Biomolecules Dep., National Inst. of Bioscience and Human-Technology, Tsukuba 305, Japan). Nippon Kagaku Kaishi, (10), 906-908 (Japanese) 1996 Nippon Kagakkai. CODEN: NKAKB8. ISSN: 0369-4577. DOCUMENT TYPE: Journal CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) In acetonitrile soln., efficient oxidn. of 2-mercaptopyridine (PySH) to disulfide was accomplished in the presence of catalytic amt. of heptylviologen (HV2+). The reaction gave the Michaelis-Menten type kinetics, which suggests that an electron is transferred from PyS- to HV2+ via the complex formation between these two species. This reaction was applied to the formation of 2-oxazolidinone deriv. from carbon dioxide and L-phenylalaninol. Contrary to the expectation, however, the reaction scarcely proceeded. This may be due to the coordination of coexisting Ph3P to HV2+, which prevents the complex formation between HV2+ and PyS-.In this experiment, several chemicals are used like 3182-95-4 and 147723-46-4 When the above system was irradiated (>370 nm), however, the reaction was enhanced. The excited PyS-* with higher reducing power probably can give an electron to HV2+ even in the absence of HV2+-PyS- complex. .

a-Aspartic acid amides

a-Aspartic acid amides. Reitz, David Bruce (Procter and Gamble Co., USA). Eur. Pat. Appl. EP 98625 A1 18 Jan 1984, 15 pp. DESIGNATED STATES: R: BE, CH, DE, FR, GB, IT, LI, NL. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C07C103-50. APPLICATION: EP 83-200775 2 Jun 1983. PRIORITY: US 82-387565 11 Jun 1982. DOCUMENT TYPE: Patent CA Section: 34 (Amino Acids, Peptides, and Proteins) Title amides were prepd. 89843-00-5 and 3182-95-4 which are cas registry numbers are also used here. by treating an a-aspartate ester with a 2-fold mol amt. of amino alcs. (S)-H2NCHR1CHROH (R = H, Me; R1 = C4-C9 alkyl) in a solvent at 50-100°. Thus, a mixt. of 0.020 mol L-leucinol and .010 mol Me a-aspartate in MeOH was refluxed 4.5 h. The MeOH was replaced by Et2O, and the ppt. recrystd. from boiling water to give 54% H-Asp-Leu-ol. .