Biocatalytic and chemical routes to all the stereoisomers of methionine and ethionine sulfoxides
摘要:
Biotransformations of the N-phthaloyl derivatives of D- and L-methionine and of D- and L-ethionine by Beauveria bassiana ATCC 7159 or Beauveria caledonica ATCC 64970 produce the corresponding (S-S) sulfoxides in good yield and diastereomeric excess. Pure (SSSC) diastereomers can be obtained from L-series substrates by crystallisation of the biotransformation extract, and the corresponding (SSRC) products obtained from D-series substrates by chromatography of the biotransformation extract. Hydrogen peroxide-catalysed oxidation of the N-phthaloyl derivatives of D- and L-methionine and of D- and L-ethionine gives diastereomeric mixtures from which the (SSSC) and (RSRC) diastereomers can be obtained by crystallisation, and the (SSRC) and (RSSC) diastereomers obtained by chromatography. N-Cbz- and N-t-Boc methionines are also converted to sulfoxides with predominant (S-S) configuration by both B, bassiana and B. caledonica, but the isolated yields and d.e. of products were generally lower than those obtained from the N-phthaloyl substrates.Removal of the N-phthaloyl group from diastereomerically pure methionine and ethionine sulfoxides gave the corresponding amino acid sulfoxides in high yield; removal of N-Cbz and N-t-Boc groups from protected methionine sulfoxides was also achieved without loss of configuration at sulfur. (C) 1994 Elsevier Science Ltd. All rights reserved.
Biocatalytic and chemical preparation of all four diastereomers of methionine sulfoxide
摘要:
Biocatalytic or chemical oxidations can be used in a complementary manner for the preparation of all four diastereomers of methionine sulfoxide with high diastereomeric purity in overall isolated yields of 20-55% from methionine. The N-phthaloyl derivatives of L-and D-methionine were selectively oxidised to the (SSSC) and (SSRC) sulfoxides respectively by biotransformation using the fungus Beauveria bassiana ATCC 7159. Hydrogen peroxide oxidation of the same materials gave mixtures from which the. (SSSC) land (RSRC) isomers can be readily isolated by crystallisation. Chromatography of the residual material then afforded the (RSSC) and (SSRC)-isomers. (C) 1998 Elsevier Science Ltd. All rights reserved.
Biocatalytic and chemical preparation of all four diastereomers of methionine sulfoxide
作者:Herbert L. Holland、Frances M. Brown
DOI:10.1016/s0957-4166(98)00042-1
日期:1998.2
Biocatalytic or chemical oxidations can be used in a complementary manner for the preparation of all four diastereomers of methionine sulfoxide with high diastereomeric purity in overall isolated yields of 20-55% from methionine. The N-phthaloyl derivatives of L-and D-methionine were selectively oxidised to the (SSSC) and (SSRC) sulfoxides respectively by biotransformation using the fungus Beauveria bassiana ATCC 7159. Hydrogen peroxide oxidation of the same materials gave mixtures from which the. (SSSC) land (RSRC) isomers can be readily isolated by crystallisation. Chromatography of the residual material then afforded the (RSSC) and (SSRC)-isomers. (C) 1998 Elsevier Science Ltd. All rights reserved.
Biocatalytic and chemical routes to all the stereoisomers of methionine and ethionine sulfoxides
作者:Herbert L Holland、Peter R Andreana、Frances M Brown
DOI:10.1016/s0957-4166(99)00271-2
日期:1999.7
Biotransformations of the N-phthaloyl derivatives of D- and L-methionine and of D- and L-ethionine by Beauveria bassiana ATCC 7159 or Beauveria caledonica ATCC 64970 produce the corresponding (S-S) sulfoxides in good yield and diastereomeric excess. Pure (SSSC) diastereomers can be obtained from L-series substrates by crystallisation of the biotransformation extract, and the corresponding (SSRC) products obtained from D-series substrates by chromatography of the biotransformation extract. Hydrogen peroxide-catalysed oxidation of the N-phthaloyl derivatives of D- and L-methionine and of D- and L-ethionine gives diastereomeric mixtures from which the (SSSC) and (RSRC) diastereomers can be obtained by crystallisation, and the (SSRC) and (RSSC) diastereomers obtained by chromatography. N-Cbz- and N-t-Boc methionines are also converted to sulfoxides with predominant (S-S) configuration by both B, bassiana and B. caledonica, but the isolated yields and d.e. of products were generally lower than those obtained from the N-phthaloyl substrates.Removal of the N-phthaloyl group from diastereomerically pure methionine and ethionine sulfoxides gave the corresponding amino acid sulfoxides in high yield; removal of N-Cbz and N-t-Boc groups from protected methionine sulfoxides was also achieved without loss of configuration at sulfur. (C) 1994 Elsevier Science Ltd. All rights reserved.