Alkyl formates as reagents for reductive amination of carbonyl compounds
作者:Oleg I. Afanasyev、Ilia Cherkashchenko、Anton Kuznetsov、Fedor Kliuev、Sergey Semenov、Olga Chusova、Gleb Denisov、Denis Chusov
DOI:10.1016/j.mencom.2020.01.037
日期:2020.1
Alkyl formates in the presence of basic additives can serve as a reagent in the direct reductive amination of carbonylcompounds. The developed procedure can be applied to various aldehydes and ketones with electron donating and electron withdrawing groups.
One aspect of the present invention relates to a method of preparing radiofluorinated substituted alkyl, cycloalkyl, aryl, and alkenyl compounds. In a preferred embodiment, potassium fluoride-18 is used. Another aspect of the invention relates to arylammonium compounds containing fluorine-18 that are useful as imaging agents. In certain embodiments, the ammonium compound is a tetraaryl ammonium salt. Another aspect of the invention relates to arylsulfonium compounds containing fluorine-18 that are useful as imaging agents. In certain embodiments, the sulfonium compound is a triaryl sulfonium salt. Another aspect of the present invention relates to a method of obtaining a positron emission image of a mammal, comprising the steps of administering to a mammal a compound of the invention, and acquiring a positron emission spectrum of the mammal.
One aspect of the present invention relates to a method of preparing radiofluorinated substituted alkyl, cycloalkyl, aryl, and alkenyl compounds. In a preferred embodiment, potassium fluoride-18 is used. Another aspect of the invention relates to arylammnonium compounds containing fluorine-18 that are useful as imaging agents. In certain embodiments, the ammonium compound is a tetraaryl ammonium salt. Another aspect of the invention relates to arylsulfonium compounds containing fluorine-18 that are useful as imaging agents. In certain embodiments, the sulfonium compound is a triaryl sulfonium salt. Another aspect of the present invention relates to a method of obtaining a positron emission image of a mammal, comprising the steps of administering to a mammal a compound of the invention, and acquiring a positron emission spectrum of the mammal.
Synthesis of Phenols from Aryl Ammonium Salts under Mild Conditions
作者:Pufan Ni、Lei Yang、Yi Shen、Lei Zhang、Yueyue Ma、Maolin Sun、Ruihua Cheng、Jinxing Ye
DOI:10.1021/acs.joc.2c01133
日期:2022.10.7
A general method for the synthesis of phenols from electron-deficient aryl ammonium salts or heteroaryl ammonium salts undermildconditions was developed. Benzaldehyde oxime, acetohydroxamic acid, and hydroxylamine hydrochloride were investigated as hydroxide surrogates respectively. With these hydroxide surrogates, a series of phenols were prepared in yields of 20–98%.
An actinic radiation sensitive polymer composition containing
(a) a polyimide precursor obtainable by the interaction of an amine compound having a photocrosslinking group with carboxyl groups of a poly(amic acid) chain, and
(b) a photoinitiator and/or photosensitizer,
in which the degree of imidization Ia is 0.03 ≤ Ia ≤ 0.6, has the characteristic features of both good stability of viscosity with lapse of time and good photosensitive performance.
一种对辐照敏感的聚合物组合物,其中含有
(a) 聚酰亚胺前体,可通过具有光交联基团的胺化合物与聚(氨基)酸链的羧基相互作用获得,以及
(b) 光引发剂和/或光敏剂、
其中亚胺化程度 Ia 为 0.03 ≤ Ia ≤ 0.6,具有随时间推移粘度稳定性好和光敏性能好的特点。