Kinetic resolution of trans-2-(1-pyrazolyl)cyclohexan-1-ol catalyzed by lipase B from Candida antarctica
作者:M. Barz、E. Herdtweck、W.R. Thiel
DOI:10.1016/0957-4166(96)00205-4
日期:1996.6
1-olrac-1 in high yields. Rac-1 forms dimers in the solid state by linking one (1R,2R)- and one (1S,2S)-enantiomer via strong intermolecular H-bonds. In the presence of the immobilized lipaseB of candidaantarctica yeast, rac-1 is acylated enantioselectively with isopropenylacetat acting as the acylating agent. Crystallisation of the reaction mixture gives enantiomerically pure (1S,2S)-1, which forms
Eggerer,H.; Gruenewaelder,C., Justus Liebigs Annalen der Chemie, 1964, vol. 677, p. 200 - 208
作者:Eggerer,H.、Gruenewaelder,C.
DOI:——
日期:——
Synthesis of 1-N-[(2S,4S)- and (2S,4R)-5-amino-4-fluoro-2-hydroxypentanoyl]dibekacins (study on structure–toxicity relationships)
作者:Yoshiaki Takahashi、Jun Kohno、Tsutomu Tsuchiya
DOI:10.1016/s0008-6215(97)10080-5
日期:1998.1
(2S,4S)- and (2S,4R)-5-azido-2-O-benzyl-4-fluoro-2-hydroxypentanoic acids (15 and 19) have been prepared from L-malic acid (1), and coupled to the H2N-1 group of 3,2',6'-tris(N-benzyloxycarbonyl)-3 "-N-(trifluoroacetyl)dibekacin (23), to give, after reduction and deblocking, 1-N-[(2S,4S)- and [(2S,4R)-(2S,4R)-5-amino-4-fluoro-2-hydroxypentanoyl]dibekacins (26 and 27). The fluorinated arbekacin analogs showed almost the same antibacterial activities as that of arbekacin, but lower toxicity. Comparision of the toxicity between 26 (and 27) and the arbekacin analogs (28-30) with change of the 1N-side-chain indicates that the observed decrease in toxicity was a function of the chain length rather than the introduction of flourine. (C) 1998 Elsevier Science Ltd. All rights reserved.