Kinetic resolution of vinyl carbonates through a lipase-mediated synthesis of their carbonate and carbamate derivatives.
摘要:
Lipase from Candida antarctica was used in the synthesis of different chiral carbonates and carbamates through the enzymic resolution of the starting racemic vinyl carbonates. A striking feature was the changeover of the enantioselectivity with regard to the one showed when vinyl carbonates were used in the resolution of alcohols and amines, thus the S enantiomer of the vinyl carbonate was resolved whereas the same enzyme was selective towards R ones when resolving alcohols and amines. In this way, compounds obtained beforehand as R carbonates were now achieved as S ones with better e.e.'s and shorter reaction times.
Vinyl carbonates as novel alkoxycarbonylation reagents in enzymatic synthesis of carbonates.
作者:Marcos Pozo、Rosalino Pulido、Vicente Gotor
DOI:10.1016/s0040-4020(01)88237-5
日期:1992.1
Carbonates could be obtained by enzymatic alkoxycarbonylation from vinyl carbonates, which are easily prepared from vinyl chloroformate. The reaction was catalyzed by Candida antarctica lipases, SP 435 and SP 435 A. The method could be also used for the synthesis of carbamates. When racemic alcohols were used, lipase catalyzed their resolution, and chiral carbonates were obtained with different enantiomeric excesses depending upon the structure of the alcohol.
Kinetic resolution of vinyl carbonates through a lipase-mediated synthesis of their carbonate and carbamate derivatives.
作者:Marcos Pozo、Vicente Gotor
DOI:10.1016/s0040-4020(01)81561-1
日期:1993.1
Lipase from Candida antarctica was used in the synthesis of different chiral carbonates and carbamates through the enzymic resolution of the starting racemic vinyl carbonates. A striking feature was the changeover of the enantioselectivity with regard to the one showed when vinyl carbonates were used in the resolution of alcohols and amines, thus the S enantiomer of the vinyl carbonate was resolved whereas the same enzyme was selective towards R ones when resolving alcohols and amines. In this way, compounds obtained beforehand as R carbonates were now achieved as S ones with better e.e.'s and shorter reaction times.