Synthesis of novel N-phosphonoalkyl dipeptide inhibitors of human collagenase
摘要:
The synthesis of a series of N-phosphonoalkyl dipeptides 6 is described. Syntheses were devised that allowed the preparation of single diastereoisomers and the assignment of stereochemistry. The compounds were evaluated in vitro for their ability to inhibit the degradation of radiolabeled collagen by purified human lung fibroblast collagenase. Several of the compounds were potent collagenase inhibitors and were at least l0-fold more potent than their corresponding N-carboxyalkyl analogues. Activity was lost when the phosphonic acid group P(O)(OH)(2) was replaced by the phosphinic acid groups P(O)(H)(OH) and P(O)(Me)(OH). At the P-1 position, (R)- or (S)-allkyl groups, especially ethyl and methyl (e.g., 12a,b, 52a,b, and 53a,b), or an (R)-phenethyl moiety (55a) conferred high potency (IC50 values in the range 0.23-0.47 mu M). (S)-Stereochemistry was preferred for the P-1(') isobutyl side chain. Structure-activity relationships were also investigated at the P-2(') site, and interestingly, compounds with basic side chains such as the guanidine 57a, were equipotent with more lipophilic compounds, such as 52a. As with other series of collagenase inhibitors, potency was enhanced by introducing bicyclic aromatic P-2(') substituents. The most potent phosphonic acid of the series was the bicyclic aromatic P-2(') tryptophan analogue 59a (IC50 0.05 mu M).
Asymmetric Synthesis of Diethyl α-Amino-α-Alkyl-Phosphonates by Alkylation of the Chiral Schiff Base Derived from (+)-Ketopinic Acid and Diethylaminomethyl Phosphonate
chiral Schiff base derived from the condensation of (+)-ketopinic acid and diethyl aminomethylphosphonate followed by hydrolysis affords diethyl (S)-α-amino-α-alkyl phosphonates with high enantiomeric excesses when benzyl or allyl halides are used in the alkylation step. An improved procedure for the preparation of diethyl aminomethylphosphonate is also reported.
Enantioselective synthesis of diethyl 1-hydroxyalkylphosphonates via oxazaborolidine catalyzed borane reduction of diethyl α-ketophosphonates
作者:Tadeusz Gajda
DOI:10.1016/s0957-4166(00)86271-0
日期:1994.10
Reduction of diethyl alpha-ketophosphonates 1 with borane and B-butyloxazaborolidine 2 as catalyst afforded diethyl (S)- or (R)-1-hydroxyalkylphosphonates 3a-d or 3e-f respectively in good yields and moderate to good enantiomeric excess (53-83 ee%). Respective diethyl (R)- and (S)-1-aminoalkylphosphonates 6 were obtained in a one-pot transformation, by the Mitsunobu reaction of 1-hydroxyphosphonates 3 with hydrazoic acid, and subsequent treatment of the intermediate azides 4, with triphenylphosphine, followed by hydrolysis df the iminophosphoranes 5 with water.
Enzymatic synthesis of optically active 1- and 2-aminoalkanephosphonates
作者:Chengye Yuan、Chengfu Xu、Yonghui Zhang
DOI:10.1016/s0040-4020(03)00995-5
日期:2003.8
A number of 1- and 2-aminoalkanephosphonates were resolved with high enantioselectivity by Candida antarctica lipase B-catalyzed acetylation. By this method, optically pure aminoalkanephosphonates and amidoalkanephosphonates, the precursors of the corresponding aminoalkanephosphonic acids, were synthesized. (C) 2003 Elsevier Ltd. All rights reserved.
Asymmetric synthesis of diethyl α-amino- α-alkyl-phosphonates by alkylation of chiral phosphonoglycine equivalents: Role of chelating effects
Diethyl alpha-amino-alpha-alkyl-phosphonates are obtained in good to high enantiomeric excesses by alkylation of chiral phosphonoglycine equivalents embodying the camphor skeleton. The chelating effects in the alkylation step play an important role in enhancing the diastereoselectivity of the reaction as substantiated by semiempirical calculations (AM1).
SCHOLLKOPF U.; SCHUTZE R., LIEBIGS ANN. CHEM.,(1987) N 1, 45-49