Stereochemistry of the Inhibition of δ-Chymotrypsin with Optically Active<i>cis</i>-Decaline-Type Organophosphates:<sup>31</sup>P-NMR studies
作者:Stefan Furegati、Walter Ganci、Georg Przibille、Peter Rüedi
DOI:10.1002/hlca.19980810526
日期:——
hydrolysis product 8 and later, while inhibition proceeded, a second one at −4.08 ppm. attributed to the δ-chymotrypsin adduct 7 (Scheme 3). Comparision of the latter signal with the 31P-NMR chemical shifts of the covalent phosphoserine model compounds (−)-6a (−5.67 ppm, axial substitution) and (+)-6b (−4.02 ppm, equatorial substitution) suggests that the inhibition proceeded via neat retention of the
δ糜蛋白酶的抑制与四个新颖,光学活性的,轴向和平展取代的调查顺-3-(2,4-二硝基苯基)-2,4-二氧杂- 3λ 5 -phosphabicyclo [4.4.0]癸烷-3- -ones(= 3-(2,4-dinitrophenoxy)hexahydro-4 H -1,3,2-benzodioxaphosphorin 2-oxides)仅显示赤道取代的对映体(-)- 4b是该酶的不可逆抑制剂,并且在pH 7.8下的(-)- 4b显示出在-2.49ppm处迅速分配给水解产物8的共振,随后抑制进行,在-4.08ppm处发生了第二个共振。归因于δ-胰凝乳蛋白酶加合物7(方案3)。后者信号与共价磷酸丝氨酸模型化合物(-)- 6a(-5.67 ppm,轴向取代)和(+)- 6b(-4.02 ppm,赤道取代)的31 P-NMR化学位移的比较表明进行经由配置的整齐保持在P-原子( - ) - 4b中