GLYCOSYLTRANSFERASE REVERSIBILITY FOR SUGAR NUCLEOTIDE SYNTHESIS
申请人:Thorson Jon S.
公开号:US20110306074A1
公开(公告)日:2011-12-15
The present invention generally relates to materials and methods for exploiting glycosyltransferase reversibility for nucleotide diphosphate (NDP) sugar synthesis. The present invention provides engineered glycosyltransferase enzymes characterized by improved reaction reversibility and expanded sugar donor specificity as compared to corresponding non-mutated glycosyltransferase enzymes. Such reagents provide advantageous routes to NDP sugars for subsequent use in a variety of biomedical applications, including enzymatic and chemoenzymatic glycorandomization.
151. The nitrosation of phenols. Part XVII. o-Fluorophenol, and a comparative study of the four o-halogenophenols
作者:Herbert H. Hodgson、Donald E. Nicholson
DOI:10.1039/jr9400000810
日期:——
Metal‐Free, Hindered, Regioselective Access to Multifunctional Groups Diarylamines via S<sub>N</sub>Ar Substitution of P‐Nitroso Aromatic Methyl Ether by Arylamines
作者:Shuliang Zou、Yazhou Zhang、Qin Wu、Tianming Zhao、Yutao Li、Bing Liu、Xianguo Ma
DOI:10.1002/chem.202303421
日期:2024.2.21
diarylamines efficiently produced from arylamines and p-nitrosoanisole derivatives by intermolecular SNAr under weak acid conditions. Relying on the catalysis of hydrogen protons, the SNAr reaction, which is endowed with resistance to space crowding, tolerance to halogen and nitroso groups, and high regioselectivity, can be carried out under mild conditions, even if the substrates involved do not have strong
弱酸条件下,芳胺与对亚硝基苯甲醚衍生物通过分子间 S N Ar 高效生成多官能团二芳胺。 S N Ar反应依靠氢质子的催化作用,具有抗空间拥挤性、对卤素和亚硝基的耐受性以及高区域选择性,即使所涉及的底物不存在,也可以在温和的条件下进行。强吸电子基团。