Papain catalyzed estehification of alanine by alcohols and diols
作者:D Cantacuzène、C Guerreiro
DOI:10.1016/s0040-4039(00)95615-6
日期:——
Papaincatalyzedesterification of Boc-Ala-OH with various alcohols and diols under biphasic conditions was investigated. Long-chain diols HO(CH2)nOH gave good yields of esterification up to n=10 whereas the homologous alcohols CnH2n+1OH condensed well only for n = 2, 4, 6. Esterification with functionnalized primary alcohols is also described.
在双相条件下,研究了木瓜蛋白酶催化的Boc-Ala-OH与各种醇和二醇的酯化反应。长链二醇HO(CH 2)nOH在n = 10时具有良好的酯化收率,而同源醇C n H 2n + 1 OH仅在n = 2、4、6时能很好地冷凝。描述。
Molecular Discrimination of <i>N-</i>Protected Amino Acid Esters by a Self-Assembled Cylindrical Capsule: Spectroscopic and Computational Studies
作者:Osamu Hayashida、Lubomir Sebo、Julius Rebek
DOI:10.1021/jo0201171
日期:2002.11.1
A self-assembled, cylindrical capsule was used to bind N-alpha-protected amino acid esters. The reversible encapsulation was studied using NMR spectroscopy in deuterated mesitylene solution and by computer-aided molecular modeling. BOC-L-alanine alkyl esters and BOC-beta-alanine alkyl esters were tested as guests, and the relative binding affinities were established by direct competition experiments. A good correlation was found between the experimental and calculated relative binding affinities in these two series. Guests that were slightly longer than the internal dimensions of the cavity were accommodated by adopting compacted conformations.