Synthesis of Allyl- and Prenylcoumarins via Microwave-Promoted Tandem Claisen Rearrangement/Wittig Olefination
作者:Bernd Schmidt、Martin Riemer
DOI:10.1055/s-0035-1560501
日期:——
sequence of Claisenrearrangement, carbonyl olefination, and cyclization upon microwave irradiation in the presence of a stabilized ylide. The products are multiply substituted 6- or 8-allylated or prenylated coumarins (2H-chromen-2-ones). Allyl, dimethylallyl, crotyl, and prenyl ethers of various aromatic ortho-hydroxy carbonyl compounds undergo a tandem sequence of Claisenrearrangement, carbonyl olefination
摘要 各种芳族邻羟基羰基化合物的烯丙基,二甲基烯丙基,巴豆基和异戊烯基醚在稳定的内酯存在下进行微波辐射后,会经历克莱森重排,羰基烯烃化和环化的串联序列。产物是被多重取代的6-或8-烯丙基化或烯丙基化的香豆素(2 H -chromen-2-ones)。 各种芳族邻羟基羰基化合物的烯丙基,二甲基烯丙基,巴豆基和异戊烯基醚在稳定的内酯存在下进行微波辐射后,会经历克莱森重排,羰基烯烃化和环化的串联序列。产物是被多重取代的6-或8-烯丙基化或烯丙基化的香豆素(2 H -chromen-2-ones)。
Visible-Light-Induced External Radical-Triggered Annulation To Access CF<sub>2</sub>-Containing Benzoxepine Derivatives
作者:Haoyue Xiang、Qing-Lan Zhao、Peng-Ju Xia、Jun-An Xiao、Zhi-Peng Ye、Xiong Xie、Huan Sheng、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.orglett.8b00131
日期:2018.3.2
A facile and diversified synthesis of functionalized CF2-containing benzoxepine derivativesvia photoredox catalysis was achieved in this work. This novel protocol features broad substrate scope, mild reaction conditions, operational simplicity, easy scale-up, and versatile derivatization, which would facilitate its practical and broad applications in the construction of valuable and synthetically
Bismuth(III) Triflate: Novel and Efficient Catalyst for Claisen and Fries Rearrangements of Allyl Ethers and Phenyl Esters
作者:B. Sreedhar、V. Swapna、Ch. Sridhar
DOI:10.1081/scc-120030693
日期:2004.12.31
Abstract Bismuth(III) triflate catalyzed Claisen and Fries rearrangements of allylphenylethers and phenyl acetates have been presented. The reaction proceeds smoothly and yields corresponding rearranged products in good yields. The bismuth triflate displays higher activity over the corresponding La, Yb, and Sc triflates.
Rationally designed benzopyran fused isoxazolidines and derived β 2,3,3 -amino alcohols as potent analgesics: Synthesis, biological evaluation and molecular docking analysis
作者:Gagandeep Singh、Gurjit Singh、Rajbir Bhatti、Vivek Gupta、Ajay Mahajan、Palwinder Singh、Mohan Paul Singh Ishar
DOI:10.1016/j.ejmech.2016.12.052
日期:2017.2
Based on structure activity analysis of morphine related opiates, we have synthesized some novel benzopyran fused isoxazolidines (2a-e) and derived conformationally constrained β2,3,3-amino alcohols (3a-e), which were evaluated in vivo for their anti-nociceptive activity through acetic acid induced writhing test (peripheral) and formalin induced algesia (central). Results showed that, compound 2a possesses
基于吗啡阿片剂相关的结构活性分析,我们已经合成了一些新颖的苯并吡喃稠合异恶唑烷(2A-E )和衍生的构象约束的β 2,3,3 -氨基醇(3A-E ),该评价在体内对它们的抗-通过乙酸引起的扭体试验(周围)和福尔马林引起的痛觉过敏(中央)产生伤害感受。结果表明,化合物2a具有显着的阿片样物质激动剂活性。此外,分子对接分析表明,化合物2a与δ阿片受体(DOR)的D得分比与μ(MOR)和κ相对更好。(KOR)受体。直至2000 mg kg -1剂量,化合物2a均未显示任何毒性。
Benzisoxazole Compound
申请人:Sasaki Atsushi
公开号:US20090318690A1
公开(公告)日:2009-12-24
Disclosed is a compound represented by the general formula (I) or a salt thereof:
wherein any one of R1, R2 and R3 represents a group represented by the formula: —(CH
2
)m-NR11R12 (wherein m is 1 or 2; and R11 and R12 independently represent a hydrogen atom or a C1-6 alkyl group or may, together with a nitrogen atom to which R11 and R12 are bound, form a 4- or 5-membered cyclic group); the remaining two or R1, R2 and R3 independently represent a group represented by the formula: —(O)n-R21 (wherein n is 0 or 1; and R21 represents a hydrogen atom, a C1-6 alkyl group, a C2-6 alkenyl group, a C2-6 alkynyl group, or the like); and R4 represents a C1-6 alkyl group which may have a substituent or the like.