Several examples of the successful reduction of N-acyl-enamine derivatives with a NADHmodel in the pyrrolo[2,3-b]pyridine series are given. It is shown, that the reduction is strongly dependent on electronic and geometrical factors. It appears that in general, the success of the reduction can be related to the ability of the magnesium ions to form a complex with the acyl group and with the enamine
A highly convergent, regioselective synthesis of apomorphine analogues is described. It relies on the intermolecular cycloaddition between a 1-methylene-1,2,3,4-tetrahydroisoquinoline and an asymmetrically substituted aryne.
Catalyst-free and oxidant-free tandem aza-Mannich/cyclization/aromatization of <i>C</i>,<i>N</i>-cyclic azomethine imines with enamides: facile synthesis of 5,6-dihydropyrazolo[5,1-<i>a</i>]isoquinolines
作者:Hao Dong、Yongxing Zhang、Xiaochen Tian、Ruochen Pang、Weiwu Ren、Yang Wang
DOI:10.1039/d2gc01275h
日期:——
tandem aza-Mannich/cyclization/aromatization reaction of C,N-cyclic azomethine imines with enamides has been developed. This practical one-step protocol enables a simple and environmentally friendly route toward the straightforward synthesis of highly substituted 5,6-dihydropyrazolo[5,1-a]isoquinolines. Different types of enamides and enamines, especially enamides derived from marketed drugs as well as bioactive
开发了一种新型高效的无催化剂、无氧化剂串联氮杂曼尼希/环化/芳构化C , N-环偶氮甲亚胺与烯酰胺反应。这种实用的一步法为直接合成高度取代的 5,6-二氢吡唑并[5,1- a ] 异喹啉提供了一种简单且环保的途径。不同类型的烯酰胺和烯胺,尤其是衍生自上市药物以及生物活性分子的烯酰胺,是合适的底物。CB1 大麻素受体拮抗剂可以基于该方法有效合成,说明这将是合成有价值的结构基序的实用策略。
A convenient formation of aporphine core via benzyne chemistry: conformational analysis and synthesis of (R)-aporphine
作者:Givago P. Perecim、Alessandro Rodrigues、Cristiano Raminelli
DOI:10.1016/j.tetlet.2015.10.083
日期:2015.12
Total synthesis of (R)-aporphine has been accomplished by an approach that employs in the key step a sequence of transformations involving a [4+2] cycloaddition reaction followed by a hydrogen migration, leading to aporphine core in good yield, which was subjected to a 1D gradient NOE experiment, conformational analysis, and simple transformations, including a small scale resolution process, to afford enantiomericallyenriched aporphine alkaloid. (C) 2015 Elsevier Ltd. All rights reserved.
Singh, Serjinder; Sharma, Vijay K., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1981, vol. 20, # 12, p. 1087 - 1088