这项工作强调了将3-乙烯基-1,2,4-三嗪用作原始的thia-Michael受体和要求反电子的Diels-Alder平台,用于新的7,8-dihydro-5 H -thiopyrano [4,3- b ]吡啶。所需但相当不稳定的炔丙基硫醇亲核试剂是在相应的炔丙基硫代乙酸酯衍生物的创新性DBU催化甲醇分解事件中成功地原位生成的。
SAR studies on new bis-aryls 5-HT7 ligands: Synthesis and molecular modeling
摘要:
Structure-activity relationships of a series of bis-arylic compounds, investigated as 5-HT7R ligands, are reported. The main structural modifications involved a central aryl moiety (phenyl, pyridine, diazine, triazine) and the nature and position of an amine-containing aliphatic chain. The affinity of the synthesized compounds (26 nM-10 mu M) was systematically correlated with other previously reported series of bis-arylic ligands and rationalized by a ligand-based pharmacophore approach. (C) 2010 Elsevier Ltd. All rights reserved.
An original one-pot Michael addition-ihDA/rDA sequence was achieved from 3-vinyl-1,2,4-triazine platforms used as unprecedented Michael acceptors. This sequence provides a novel access to functionalized [2,3]-fused pyridine derivatives via a unique enamine promoted intramolecular ihDA reaction of 1,2,4-triazine intermediates.
original bifunctional platforms for the domino conjugate addition inverse-electron-demandhetero-Diels–Alder/retro-Diels–Alder (ihDA/rDA) reaction, was achieved using the highly acidic triflimide as an organocatalyst. Based on the use of alkoxyamine nucleophiles, this sequence not only highlights a rare example of the catalytic aza-Michael reaction to alkenylazaarenes but also proves to be useful for the elaboration
空前的催化氮杂-迈克尔加成反应,取代了3-乙烯基-1,2,4-三嗪,作为多米诺共轭物加成反应的反向双电子平台,反电子需求异Diels–Alder / RetroDiels–Alder(ih DA /使用高度酸性的三氟甲酰亚胺作为有机催化剂可实现r DA)反应。基于烷氧基胺亲核试剂的使用,该序列不仅突出了催化氮杂-迈克尔与链烯基氮杂芳烃反应的罕见实例,而且还证明可用于制备一系列与生物有关的四氢-[1,6]-萘啶。
Domino Aza-Michael-<i>ih</i>-Diels–Alder Reaction to Various 3-Vinyl-1,2,4-triazines: Access to Polysubstituted Tetrahydro-1,6-naphthyridines
A straightforward domino aza-Michael-inverseelectron-demand-hetero-Diels Alder/retro-Diels-Alder reaction between primary and secondary propargylamine derivatives and 3-vinyl-1,2,4-triazines is developed highlighting not only the uniqueness of this dual-heterocyclic platform but also a novel and unprecedented path to polysubstituted tetrahydro-1,6-naphthyridine scaffolds.