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[求助]
大神们,真心求助!有200BB相赠!!!
Within the limits of experimental error, the title compounds withD-confi guration displayed better antitumor activities against Bcap37 compared to their respective L -counterparts e.g. D-II a(52.3%) > L- II a (16.9%),D-II e (70.2%)> L-II e (25.9%), D-IIi (34.0%) >L-II i (26.1%). Furthermore, the compound bearing a fl uorine atom at the 4-position of the benzyl ring linked to the nitrogen atom of theamide (R1= p -F) showed good antitumor activities with inhibition rate ranging from 55.7 to 89.1% against BGC823 cell lines. With regard to the alkyl substituents (R2) in the phosphonate part of the studied compounds, D-diastereoisomers with diethyl substituents
(R2 =Et) displayed signi fi cant enhancement towards inhibition against Bcap37, PC3 and BGC823 cells in comparison with D- O,O-dialkylphosphonates derived from n-propyl, isopropyl or n–butyl groups. In particular, the compound D-IIe(R1 =o -F, R2 = Et) dis-played most promising result amongst all. The L –diastereoisomers of O,O-diisopropylphosphonate e.g. L -II k(R1 = p-F, R2 = i-Pr), L -IIc(R1 = H, R2=i-Pr), L -II g(R1=o-F, R2=i-Pr), on the other hand,revealed higher antitumor activities than the L-diastereoisomers of phosphonates derived from ethyl,n -propyl or butyl groups (R2= Et, n-Pr, Bu). Thus, the nature of stereochemical con fi guration (D or L ) of the amino acid amide part, type of substituents (R1) in the aromatic ring as well as alkyl substituents (R2) in the phosphonate moiety of the title compounds appear to be the key factors in controlling the antitumor activity. While phosphonates derived from branched alkyl chains were preferred over straight-chain alkyls forL-diastereoisomers, simple diethyl derived phosphonates gave better result with D-diastereoisomers. Therefore, for ideal activity, R1should be a strong electron withdrawing group and for L-diastereoisomers R2 should be i-Pr, whereas for D -diastereoiso-mers R2 needs to be Et. Although our studies indicate the existence of a definite relationship of antitumor activity with the nature of substituents and type of confi guration within the compound, the role of steric, electronic and hydrophobic effects at physiological pH on structureeactivity relationships could not be successfully ascertained due to lack of structural diversity.
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