An Enaminone-Directed Benzannulation/Macrocyclization Approach to Cyclophane Ring Systems
摘要:
A straightforward and modular preparative approach to 1,3,5-triaroylbenzene-based functionalized cyclophane ring systems has been developed. The key cyclophane-forming macrocyclization reaction was accomplished during the course of a regioselective cross-benzannulation between bis(aryl ethynyl) ketone and enaminone reactants. Macrocyclic products with ring sizes ranging from 18-to 22-membered were successfully constructed. The composition of the tether connecting the two aryl ethynyl ketone fragments can be easily varied; consequently, this method is suitable for construction of a diverse range of structurally distinct cyclophane products. To illustrate this feature, cyclophanes possessing xylyl, alkyl, di(ethylene triamine), and di(ethylene oxy) bridging units were synthesized in isolated yields of 11-46%. Three new cyclophanes (calixarene-like macrocyles 8 and 9, as well as crownophane 18) were structurally characterized by X-ray diffractometry.
Multicomponent synthesis of novel 3-benzoyl-4h-benzo[g]chromene-5,10-dione derivatives
作者:Giang Le-Nhat-Thuy、Tuyet Anh Dang Thi、Phuong Hoang Thi、Quynh Giang Nguyen Thi、Ha-Thanh Nguyen、Doan Vu Ngoc、Tuan-Anh Nguyen、Tuyen Van Nguyen
DOI:10.1016/j.tetlet.2021.153215
日期:2021.7
developed to prepare a series of novel 3-benzoyl-4H-benzo[g]chromene-5,10-dione derivatives from 2-hydroxy-1,4-naphthoquinone, aromatic aldehydes and arylenaminones in glacial acetic acid under microwave irradiation. This transformation presumably occurs via a Knoevenagel condensation – dehydration – Michael addition – O-cyclization – proton transfer - elimination - deprotonation – double bond isomerization
for the synthesis of 3-benzoyl-5-hydroxy benzofuran and naphtho[1,2-b]furan derivatives at room temperature in an environmentally friendly method. This catalyst system resulted in excellent yields in short reaction times and high selectivity. Conclusion: We have developed a green highly efficient and environmentally friendly protocol for the facile synthesis of 3-benzoyl-5-hydroxy benzofuran and naphtho[1
Analogues of Dehydroacetic Acid as Selective and Potent Agonists of an Ectopic Odorant Receptor through a Combination of Hydrophilic and Hydrophobic Interactions
作者:Bernie Byunghoon Park、NaHye Lee、YunHye Kim、YoonGyu Jae、Seunghyun Choi、NaNa Kang、Yu Ri Hong、Kiwon Ok、Jeonghee Cho、Young Ho Jeon、Eun Hee Lee、Youngjoo Byun、JaeHyung Koo
DOI:10.1002/cmdc.201600612
日期:2017.4.6
Molecular docking and site-directed mutagenesis studies suggested that a combination of hydrophilic and hydrophobicinteractions is central to the selective and specific binding of 10 to Olfr895. The design of agonists armed with both hydrophilic and hydrophobic portions could therefore lead to highly potent and selective ligands for ectopic ORs.
The present invention relates to a β3 adrenergic receptor agonist of formula (I); or a pharmaceutical salt thereof; which is capable of increasing lipolysis and energy expenditure in cells and, therefore, is useful, e.g., for treating Type 2 diabetes and/or obesity.