Intramolecular electrophilic hydroarylation via Claisen rearrangement: synthesis of chromenes, heterothiochromenes and heterodihydrothiochromenes
摘要:
We have designed and synthesized several basic and novel fused ring heterocycles by intramolecular hydroarylation with an efficiency and scope to develop intermediates of potential value. This method demonstrated consistent performance with arene-ene and arene-yne substrates of diverse structural features, including propargyl ethers, allyl thioethers, and propargyl thioethers resulting in 6-endo products. (c) 2006 Elsevier Ltd.. All rights reserved.
Intramolecular electrophilic hydroarylation via Claisen rearrangement: synthesis of chromenes, heterothiochromenes and heterodihydrothiochromenes
摘要:
We have designed and synthesized several basic and novel fused ring heterocycles by intramolecular hydroarylation with an efficiency and scope to develop intermediates of potential value. This method demonstrated consistent performance with arene-ene and arene-yne substrates of diverse structural features, including propargyl ethers, allyl thioethers, and propargyl thioethers resulting in 6-endo products. (c) 2006 Elsevier Ltd.. All rights reserved.
Verbindungen der Formel I
worin A einen divalenten Radikal -S-CR₄=CR₅-, worin R₄ und R₅ unabhängig voneinander Wasserstoff oder Niederalkyl, R₁ Wasserstoff, Niederalkyl oder Arylniederalkyl, R₂ Wasserstoff, Niederalkyl oder Arylniederalkyl, oder R₁ und R₂ zusammen Alkylen mit 4 bis 6 C-Atomen, R₃ Wasserstoff oder Niederalkyl bedeuten; S-Oxide davon; und pharmazeutisch annehmbare Salze davon, welche als präsynaptische Dopamin-Rezeptor-Agonisten für die Behandlung von Störungen des zentralen Nervensystems verwendet werden können. Sie werden beispielsweise hergestellt, indem man eine Verbindung der Formel II
mit einer Verbindung der Formel III
kondensiert.
一种式 I 的化合物
其中 A 为二价基 -S-CR₄=CR₅- 其中 R₄ 和 R₅ 独立地为氢或低级烷基,R₁ 为氢、低级烷基或芳基低级烷基,R₂ 为氢、低级烷基或芳基低级烷基,或 R₁ 和 R₂ 共同为 4 至 6 个碳原子的亚烷基,R₃ 为氢或低级烷基;其 S-氧化物;及其药学上可接受的盐类,可用作突触前多巴胺受体激动剂,用于治疗中枢神经系统疾病。它们的制备方法包括,例如,将式 II 的化合物
与式 III
缩合而成。
US4816474A
申请人:——
公开号:US4816474A
公开(公告)日:1989-03-28
Intramolecular electrophilic hydroarylation via Claisen rearrangement: synthesis of chromenes, heterothiochromenes and heterodihydrothiochromenes
作者:Rajesh S. Kenny、Uday C. Mashelkar、Deepak M. Rane、Dinesh K. Bezawada
DOI:10.1016/j.tet.2006.06.079
日期:2006.9
We have designed and synthesized several basic and novel fused ring heterocycles by intramolecular hydroarylation with an efficiency and scope to develop intermediates of potential value. This method demonstrated consistent performance with arene-ene and arene-yne substrates of diverse structural features, including propargyl ethers, allyl thioethers, and propargyl thioethers resulting in 6-endo products. (c) 2006 Elsevier Ltd.. All rights reserved.