Analysis of the 220-MHz, P.M.R. spectra of some products of the amadori and heyns rearrangements
作者:Johannes H. Altena、Godefridus A.M. van den Ouweland、Cornelis J. Teunis、Sing B. Tjan
DOI:10.1016/s0008-6215(00)85980-7
日期:——
spectroscopy is useful for identifying Amadori- and Heyns-rearrangement products, the p.m.r. spectra at 220 MHz of 16 rearrangementproducts derived from d -glucose or d -fructose and amino acids have been investigated. At pH 3, the protons of the NCH 2 group of N -substituted 1-amino-1-deoxy- d -fructose (Amadori-rearrangement products) resonate at δ 3.25–3.60 in D 2 O and are shifted upfield by 0.3–0
摘要为了确定pmr光谱法对鉴定Amadori-和Heyns重排产物是否有用,研究了16种由d-葡萄糖或d-果糖和氨基酸衍生的重排产物在220 MHz下的pmr谱。在pH 3时,N-取代的1-氨基-1-脱氧-d-果糖(Amadori重排产物)的NCH 2基团的质子在D 2 O中以δ3.25–3.60共振,并向高场偏移0.3–0.6。 pH值为9时,ppm。这些质子与氘交换。另外,在D 2 O中,无环,呋喃糖和吡喃糖结构平衡,最后一种是有利的。在pH⩾7时,平衡完全转移到β-吡喃糖形式,该形式仅采用2 C 5构象。在pH 3时,平衡有利于β-呋喃糖形式。在pH为3的情况下,N-取代的2-氨基-2-脱氧-d-葡萄糖(Heyns重排产物)的H-1 e和H-1a分别在δ5.55和5.04处共振。在pH 9时,H-2的信号向高场移动0.2-0.7 ppm,在D 2 O溶液中,这些化合物以4 C 1构象
N.m.r. spectroscopy of N-(1-deoxy-d-fructos-1-yl)-l-amino acids (“fructose-amino acids”)
Abstract High-resolution, 1 H- (360 and 400 MHz) and 13 C-n.m.r. (90.52 and 100.57 MHz) spectra of the mutarotated N -(1-deoxy- d -fructos-1-yl)- l -amino acids (“fructose-aminoacids”) 1–14 in D 2 O are reported. The 1 H spectra allow unambiguous assignment of the signals of the major constituents (β-pyranose forms). Signals of the other forms are not well resolved and therefore not interpreted. The