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pro vyhledávání: '"Syméon Antoulas"'
Publikováno v:
Helvetica Chimica Acta. 73:1276-1299
All four stereoisomers of (E)-vitamin Kb i. e. (21E, 7R, 111R)-l (= 1a), (21E, 71 R, l11S)-1 (= 1b), (21E, 71 S, 111S) 1 ( = 1c), and (21E, 71S, 111R)-l ( = Id), have been synthesized in a state of high chemical and stereoisomeric purity. The synthes
Publikováno v:
Helvetica Chimica Acta. 69:210-220
Polyacetylated 5,6,7,8-Tetrahydro-D- and L-neopterins. A Special Case of N(5)-Alkylation of 5,6,7,8-Tetrahydroneopterins Improved conditions are reported for the preparation of the earlier described (6R)- and (6S)-1′-O,2′-O,3′-O,2-N,5-pentaacet