Biocatalytic oxidative kinetic resolution of sec-alcohols: stereocontrol through substrate-modification
摘要:
Whole lyophilised cells of Rhodococcus ruber DSM 44541 were employed for the oxidative kinetic resolution of sec-alcohols using acetone as hydrogen acceptor. The enantioselectivity of this process could be controlled effectively by introducing C-C multiple bonds into substrates, which were inefficiently recognised, in particular short-chain (omega-1)-alcohols and (omega-2)-analogs. Thus, the enantioselectivities of rac-2-pentanol (E= 16.8) and rac-3-octanol (E= 13.3) were significantly improved by introducing a C=C bond adjacent to the alcohol moiety to give racemic (E)-pent-3-en-2-ol and 4-(E)-octen-3-ol, which were resolved with excellent selectivities (E >100 and 50, respectively). In addition, it was found that high stereodifferentiation between the E- and Z-configured double bonds occurred, as the corresponding (Z)-isomers were not converted. Similar selectivity-enhancing effects were observed with acetylenic analogs. (C) 2003 Elsevier Science Ltd. All rights reserved.
Biocatalytic oxidative kinetic resolution of sec-alcohols: stereocontrol through substrate-modification
摘要:
Whole lyophilised cells of Rhodococcus ruber DSM 44541 were employed for the oxidative kinetic resolution of sec-alcohols using acetone as hydrogen acceptor. The enantioselectivity of this process could be controlled effectively by introducing C-C multiple bonds into substrates, which were inefficiently recognised, in particular short-chain (omega-1)-alcohols and (omega-2)-analogs. Thus, the enantioselectivities of rac-2-pentanol (E= 16.8) and rac-3-octanol (E= 13.3) were significantly improved by introducing a C=C bond adjacent to the alcohol moiety to give racemic (E)-pent-3-en-2-ol and 4-(E)-octen-3-ol, which were resolved with excellent selectivities (E >100 and 50, respectively). In addition, it was found that high stereodifferentiation between the E- and Z-configured double bonds occurred, as the corresponding (Z)-isomers were not converted. Similar selectivity-enhancing effects were observed with acetylenic analogs. (C) 2003 Elsevier Science Ltd. All rights reserved.
Transition metal promoted alkylations of unsaturated alcohols. Alkylation of alkynols with organoalanes promoted by Group IVA metal-cyclopentadienyl compounds
作者:David C. Brown、Stephen A. Nichols、A. Bruce Gilpin、David W. Thompson
DOI:10.1021/jo01334a002
日期:1979.9
BROWN D. C.; NICHOLS S. A.; GILPIN A. B.; THOMPSON D. W., J. ORG. CHEM., 1979, 44, NO 20, 3457-3461
作者:BROWN D. C.、 NICHOLS S. A.、 GILPIN A. B.、 THOMPSON D. W.
DOI:——
日期:——
Biocatalytic oxidative kinetic resolution of sec-alcohols: stereocontrol through substrate-modification
Whole lyophilised cells of Rhodococcus ruber DSM 44541 were employed for the oxidative kinetic resolution of sec-alcohols using acetone as hydrogen acceptor. The enantioselectivity of this process could be controlled effectively by introducing C-C multiple bonds into substrates, which were inefficiently recognised, in particular short-chain (omega-1)-alcohols and (omega-2)-analogs. Thus, the enantioselectivities of rac-2-pentanol (E= 16.8) and rac-3-octanol (E= 13.3) were significantly improved by introducing a C=C bond adjacent to the alcohol moiety to give racemic (E)-pent-3-en-2-ol and 4-(E)-octen-3-ol, which were resolved with excellent selectivities (E >100 and 50, respectively). In addition, it was found that high stereodifferentiation between the E- and Z-configured double bonds occurred, as the corresponding (Z)-isomers were not converted. Similar selectivity-enhancing effects were observed with acetylenic analogs. (C) 2003 Elsevier Science Ltd. All rights reserved.