Enzymatic preparation of homochiral 2-(n-carbobenzyloxypiperid-4-yl)-1,3-propanediol monoacetate. A facile entry to both enantiomers of 3- hydroxymethylquinuclidine.
摘要:
Both enantiomers of monoacetate 1 have been prepared in high ee by lipase catalyzed monohydrolysis of the prochiral diacetate 3 and by monoacetylation of the corresponding diol 4. 3-Hydroxymethylquinuclidine 2 was then synthesized in both enantiomeric forms with an ee up to 98% starting from (+)-1.
Enzymatic preparation of homochiral 2-(n-carbobenzyloxypiperid-4-yl)-1,3-propanediol monoacetate. A facile entry to both enantiomers of 3- hydroxymethylquinuclidine.
摘要:
Both enantiomers of monoacetate 1 have been prepared in high ee by lipase catalyzed monohydrolysis of the prochiral diacetate 3 and by monoacetylation of the corresponding diol 4. 3-Hydroxymethylquinuclidine 2 was then synthesized in both enantiomeric forms with an ee up to 98% starting from (+)-1.
Enzyme catalysed asymmetrization of pyridyl substituted 1,3-propanediols and of the corresponding diacetates
作者:Giuseppe Guanti、Enrica Narisano、Renata Riva
DOI:10.1016/s0957-4166(97)00218-8
日期:1997.7
2-(4-pyridyl)- and 2-(2-pyridyl)-1,3-propanediols 1 and 4 were prepared and asymmetrized by enantioselective acetylation in organic solvent catalysed by hydrolytic enzymes, the best being supported pig pancreatic lipase, to give new valuable heterocyclic chiral building blocks. The asymmetrization of diacetate 6, catalysed by pig pancreatic lipase is also described. (C) 1997 Elsevier Science Ltd.