Pyrrole-Based Anion-Responsive π-Electronic Molecules as Hydrogen-Bonding Catalysts
作者:Goki Hirata、Hiromitsu Maeda
DOI:10.1021/acs.orglett.8b00855
日期:2018.5.18
boron complexes as hydrogen-bonding donor organocatalysts were examined by the Mannich-type reaction of N-acyl heteroarenium chlorides with 1-methoxy-2-methyl-1-trimethylsiloxy-1-propene, as well as by the classical N-alkylation of amines with trityl chloride under base-free conditions. 1H NMR examinations of the hydrogen-bonding interaction between the pyrrole NH of the catalyst and the Cl– in the
N-酰基杂芳基氯化物与1-甲氧基-2-甲基-1-三甲基甲硅烷氧基-1-丙烯的曼尼希型反应以及经典的N检验了二吡咯基二酮硼配合物作为氢键供体有机催化剂的能力。在无碱条件下用三苯甲基氯对胺进行烷基化。1个催化剂的吡咯NH和氯之间的氢键相互作用的1 H NMR检查-在Ñ酰基heteroarenium盐建议的激活Ñ酰基heteroarenium氯化物阴离子通过由催化剂发生结合。
PROCESS FOR PREPARING AMLODIPINE BENZENESULPHONATE
申请人:RICHTER GEDEON VEGYESZETI GYAR RT.
公开号:EP1196383B1
公开(公告)日:2004-12-01
US6596874B1
申请人:——
公开号:US6596874B1
公开(公告)日:2003-07-22
Reductive Demercuration in Deprotection of Trityl Thioethers, Trityl Amines, and Trityl Ethers
作者:M. Maltese
DOI:10.1021/jo0156971
日期:2001.11.1
rapidly cleaved by even dilute HCl solutions, while cleaving of trityl amines is modulated by HCl concentration. Addition of NaBH(4) to solutions of monofunctional trityl ethers in HgCl(2)/MeCN leads to complete deprotection. Monofunctional trityl amines are partially deprotected only if the complexation reaction is allowed to reach equilibrium. Combination of H(+)- with HgX(+)-catalyzed detritylation methods