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Volumn 22, Issue 9, 2008, Pages 516-522

Synthesis of a series of boronated unnatural cyclic amino acids as potential boron neutron capture therapy agents

Author keywords

Boronic acids; Cyclic amino acids; Neutron capture therapy; Synthesis

Indexed keywords

AMINATION; AMINES; AMINO ACIDS; BORON; BORON COMPOUNDS; SYNTHESIS (CHEMICAL);

EID: 51349131942     PISSN: 02682605     EISSN: 10990739     Source Type: Journal    
DOI: 10.1002/aoc.1435     Document Type: Article
Times cited : (23)

References (75)
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    • In our previous studies, syntheses of the boronated cyclobutyl-and cyclopentyl-based hydantoins using the Bücherer- Strecker reaction resulted primarily in the cis products, in which the amide fragment of the hydantoin was cis to the substituent on the ring evidenced by an X-ray crystallographic study of one cyclopentyl derivative, The 13C NMR of the cis racemate revealed that the resonances of the carbonyl carbons in the hydantoin ring appeared downfield of the corresponding trans racemate, In the present study, all of the major products have 13C resonances of the hydantoin carbonyls that appear downfield of the minor isomer, See A. Naravane, Ph.D.Thesis, Synthesis of novel boronated amino acids for BNCT an alternate cancer therapy and use of microwaves in organic synthesis. The University of Tennessee, 2007;
    • 13C resonances of the hydantoin carbonyls that appear downfield of the minor isomer.) See A. Naravane, Ph.D.Thesis, Synthesis of novel boronated amino acids for BNCT an alternate cancer therapy and use of microwaves in organic synthesis. The University of Tennessee, 2007;
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    • G. Kabalka, A. Naravane, M. L. Yao, J. Coderre, Y. Chung, K. Riley, Synthesis and in vivo distribution of 1-amino-3- boronocyclopentanecarboxylic acids. Abstracts, 12th International Congress on Neutron Capture Therapy, Takamatsu, Kagawa, 9-13 October, 2006.
    • b) G. Kabalka, A. Naravane, M. L. Yao, J. Coderre, Y. Chung, K. Riley, Synthesis and in vivo distribution of 1-amino-3- boronocyclopentanecarboxylic acids. Abstracts, 12th International Congress on Neutron Capture Therapy, Takamatsu, Kagawa, 9-13 October, 2006.
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    • Although no details regarding gas evolution were noted in the earlier report focused on the hydroboration of N-alkenylureas and N-alkenyl-carbamates, 27] the authors did utilize excess BH3·THF in their reactions. However, they make a strong case for the intermediacy of borane-amine complex, which then hydroborates the alkene to generate a monoalkylboronic acid. If, indeed, hydrogen gas was not evolved in the earlier studies, our observations may speak to the enhanced reactivity of dialkylborane reagents (when compared with borane itself) toward amide protons
    • 3·THF in their reactions. However, they make a strong case for the intermediacy of borane-amine complex, which then hydroborates the alkene to generate a monoalkylboronic acid. If, indeed, hydrogen gas was not evolved in the earlier studies, our observations may speak to the enhanced reactivity of dialkylborane reagents (when compared with borane itself) toward amide protons.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.