Studies on the disproportionation of mixed anhydrides of N‐alkoxycarbonylamino acids
Mixed anhydrides from Z‐valine and ethyl, isobutyl, isopropyl and isopropenyl chloroformate, and from N‐tert ‐butoxycarbonyl‐ (Boc) and N ‐benzyloxycarbonyl‐ (Z) leucine and phenylalanine and Boc‐ and N ‐9‐fluorenylmethoxycarbonyl‐valine and ethyl chloroformate were purified and left in dichlorometh...
Published in: | International Journal of Peptide and Protein Research |
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Language: | English |
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Wiley
1993
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Online Access: | http://dx.doi.org/10.1111/j.1399-3011.1993.tb00449.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1399-3011.1993.tb00449.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1399-3011.1993.tb00449.x |
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crwiley:10.1111/j.1399-3011.1993.tb00449.x 2024-06-02T08:05:12+00:00 Studies on the disproportionation of mixed anhydrides of N‐alkoxycarbonylamino acids BENOITON, N. LEO LEE, YOUNG C. CHEN, FRANCIS M.F. 1993 http://dx.doi.org/10.1111/j.1399-3011.1993.tb00449.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1399-3011.1993.tb00449.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1399-3011.1993.tb00449.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Peptide and Protein Research volume 41, issue 4, page 338-341 ISSN 0367-8377 journal-article 1993 crwiley https://doi.org/10.1111/j.1399-3011.1993.tb00449.x 2024-05-03T11:33:21Z Mixed anhydrides from Z‐valine and ethyl, isobutyl, isopropyl and isopropenyl chloroformate, and from N‐tert ‐butoxycarbonyl‐ (Boc) and N ‐benzyloxycarbonyl‐ (Z) leucine and phenylalanine and Boc‐ and N ‐9‐fluorenylmethoxycarbonyl‐valine and ethyl chloroformate were purified and left in dichloromethane at 23°C. The symmetrical anhydride (SyAn) generated after 24 h was determined by normal phase high‐performance chromatography. No SyAn was produced from the anhyrides of Z‐ and Boc‐valine; SyAn was produced from the other anhydrides. Anhydrides examined without isolation generally produced more SyAn than the pure compounds. More SyAn was generated in dimethylformamide and tetrahydrofuran than in dichloromethane, or in the presence of an excess of N ‐methylmorpholine or triethylamine. The anhydride from isobutyl chloroformate was much more stable than the anhydride from ethyl chloroformate. It is suggested that disproportionation of pure mixed carboxylic acid – carbonic acid anhydrides occurs by a bimolecular mechanism. Article in Journal/Newspaper Carbonic acid Wiley Online Library Syan ENVELOPE(146.024,146.024,59.521,59.521) International Journal of Peptide and Protein Research 41 4 338 341 |
institution |
Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Mixed anhydrides from Z‐valine and ethyl, isobutyl, isopropyl and isopropenyl chloroformate, and from N‐tert ‐butoxycarbonyl‐ (Boc) and N ‐benzyloxycarbonyl‐ (Z) leucine and phenylalanine and Boc‐ and N ‐9‐fluorenylmethoxycarbonyl‐valine and ethyl chloroformate were purified and left in dichloromethane at 23°C. The symmetrical anhydride (SyAn) generated after 24 h was determined by normal phase high‐performance chromatography. No SyAn was produced from the anhyrides of Z‐ and Boc‐valine; SyAn was produced from the other anhydrides. Anhydrides examined without isolation generally produced more SyAn than the pure compounds. More SyAn was generated in dimethylformamide and tetrahydrofuran than in dichloromethane, or in the presence of an excess of N ‐methylmorpholine or triethylamine. The anhydride from isobutyl chloroformate was much more stable than the anhydride from ethyl chloroformate. It is suggested that disproportionation of pure mixed carboxylic acid – carbonic acid anhydrides occurs by a bimolecular mechanism. |
format |
Article in Journal/Newspaper |
author |
BENOITON, N. LEO LEE, YOUNG C. CHEN, FRANCIS M.F. |
spellingShingle |
BENOITON, N. LEO LEE, YOUNG C. CHEN, FRANCIS M.F. Studies on the disproportionation of mixed anhydrides of N‐alkoxycarbonylamino acids |
author_facet |
BENOITON, N. LEO LEE, YOUNG C. CHEN, FRANCIS M.F. |
author_sort |
BENOITON, N. LEO |
title |
Studies on the disproportionation of mixed anhydrides of N‐alkoxycarbonylamino acids |
title_short |
Studies on the disproportionation of mixed anhydrides of N‐alkoxycarbonylamino acids |
title_full |
Studies on the disproportionation of mixed anhydrides of N‐alkoxycarbonylamino acids |
title_fullStr |
Studies on the disproportionation of mixed anhydrides of N‐alkoxycarbonylamino acids |
title_full_unstemmed |
Studies on the disproportionation of mixed anhydrides of N‐alkoxycarbonylamino acids |
title_sort |
studies on the disproportionation of mixed anhydrides of n‐alkoxycarbonylamino acids |
publisher |
Wiley |
publishDate |
1993 |
url |
http://dx.doi.org/10.1111/j.1399-3011.1993.tb00449.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1399-3011.1993.tb00449.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1399-3011.1993.tb00449.x |
long_lat |
ENVELOPE(146.024,146.024,59.521,59.521) |
geographic |
Syan |
geographic_facet |
Syan |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
International Journal of Peptide and Protein Research volume 41, issue 4, page 338-341 ISSN 0367-8377 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1399-3011.1993.tb00449.x |
container_title |
International Journal of Peptide and Protein Research |
container_volume |
41 |
container_issue |
4 |
container_start_page |
338 |
op_container_end_page |
341 |
_version_ |
1800749979335131136 |