Photochemistry of 1-phenyl-1,2-dihydronaphthalene in methanol
摘要:
The photochemistry of 1-phenyl-1,2-dihydronaphthalene (1) in methanol and hexane has been investigated. The lack of influence of solvent polarity and of the presence of sulfuric acid on the rate of formation of exo-4-phenylbenzobicyclo[3.1.0]hex-2-ene (exo-2) from the primary, ring-opened photoproduct cZt-3a of 1 precludes a sudden-polarized, zwitterionic excited state from being involved in the intramolecular [4 + 2] photocycloaddition reaction leading to exo-2. The experimental results can be rationalized by assuming that this photoprocess involves a concerted pi-4a + pi-2a-type electrocyclic reaction. cis-Dibenzobicyclo[3.3.0]octa-2,7-diene (8) is proposed to arise by photocyclization of cZc-3b, followed by a thermal rearrangement. On irradiation of 1 with a broad-spectrum lamp, the ratio of the photoproducts exo-2 and 8 is correlated with the ratio of the pe and pa conformers of 1. The novel compound 1-(o-benzylphenyl)allene (6) is also formed under these conditions. Irradiation of 1 at 254 nm yields 8 as the only photoproduct. Photochemical addition of methanol was observed to complete with the photoprocess, leading to exo-2, though at a comparatively low level. A photodecomposition mode of exo-2, presumably involving heterolytic cleavage of the cyclopropane ring, presents the chief source of methoxylated photoproducts at low temperatures in methanol.
Photochemistry of 1-phenyl-1,2-dihydronaphthalene in methanol
摘要:
The photochemistry of 1-phenyl-1,2-dihydronaphthalene (1) in methanol and hexane has been investigated. The lack of influence of solvent polarity and of the presence of sulfuric acid on the rate of formation of exo-4-phenylbenzobicyclo[3.1.0]hex-2-ene (exo-2) from the primary, ring-opened photoproduct cZt-3a of 1 precludes a sudden-polarized, zwitterionic excited state from being involved in the intramolecular [4 + 2] photocycloaddition reaction leading to exo-2. The experimental results can be rationalized by assuming that this photoprocess involves a concerted pi-4a + pi-2a-type electrocyclic reaction. cis-Dibenzobicyclo[3.3.0]octa-2,7-diene (8) is proposed to arise by photocyclization of cZc-3b, followed by a thermal rearrangement. On irradiation of 1 with a broad-spectrum lamp, the ratio of the photoproducts exo-2 and 8 is correlated with the ratio of the pe and pa conformers of 1. The novel compound 1-(o-benzylphenyl)allene (6) is also formed under these conditions. Irradiation of 1 at 254 nm yields 8 as the only photoproduct. Photochemical addition of methanol was observed to complete with the photoprocess, leading to exo-2, though at a comparatively low level. A photodecomposition mode of exo-2, presumably involving heterolytic cleavage of the cyclopropane ring, presents the chief source of methoxylated photoproducts at low temperatures in methanol.
Styrene derivatives reacted with diphenyl(trifluoromethanesulfonyloxy)sulfonium trifluoromethanesulfonate (1) at low temperature to afford 2-arylethenyl(diphenyl)sulfonium triflates (2). Treatment of 2 with primary amines gave the corresponding 2-arylaziridines in high yields. One-pot synthesis of various aziridines was also successfully carried out without isolation of the intermediate 2.
[EN] SECOND GENERATION GRP94-SELECTIVE INHIBITORS<br/>[FR] INHIBITEURS SÉLECTIFS DE GRP94 DE SECONDE GÉNÉRATION
申请人:UNIV KANSAS
公开号:WO2019040792A1
公开(公告)日:2019-02-28
The present technology provides compounds selective for the Grp94 isoform, as well as compositions including such compounds, that are useful for treatment of multiple myeloma, melanoma, lung cancer, hepatocellular carcinoma, breast cancer, prostate cancer, and/or glaucoma. Methods using the compounds are also provided.
Second Generation Grp94-Selective Inhibitors Provide Opportunities for the Inhibition of Metastatic Cancer
作者:Vincent M. Crowley、Dustin J. E. Huard、Raquel L. Lieberman、Brian S. J. Blagg
DOI:10.1002/chem.201703398
日期:2017.11.7
the 90 kDa heat shock protein (Hsp90) family and its inhibition represents a promising therapeutic target for the treatment of many diseases. Modification of the first generation cis‐amide bioisostereimidazole to alter the angle between the resorcinol ring and the benzyl side chain via cis‐amide replacements produced compounds with improved Grp94 affinity and selectivity. Structure–activity relationship
葡萄糖调节蛋白94(Grp94)是90 kDa热休克蛋白(Hsp90)家族的内质网(ER)常驻同工型,其抑制作用代表了治疗许多疾病的有希望的治疗靶标。修改第一代顺式酰胺生物同工甾醇咪唑,通过顺式酰胺替代来改变间苯二酚环与苄基侧链之间的夹角,从而制得了具有改善的Grp94亲和力和选择性的化合物。结构-活性关系研究导致发现化合物30,该化合物表现为540 n m对Grp94的亲和力和73倍的选择性。Grp94负责与细胞信号传导和运动相关的蛋白质(包括选定的整联蛋白)的成熟和运输。研究表明,Grp94选择性抑制剂30对多种侵袭性和转移性癌症表现出有效的抗迁移作用。
Palladium-catalyzed benzylic C(sp3)–H arylation of o-alkylbenzaldehydes
作者:Lan Lei、Ping Wu、Zhuqing Liu、Jiang Lou
DOI:10.1016/j.tetlet.2021.152865
日期:2021.3
The palladium-catalyzed benzylic C(sp3)–H arylation of o-alkylbenzaldehyde derivatives was achieved utilizing 2-dimethylaminoethylamine as a novel transient directing group. The γ-C(sp3)–H arylation reaction efficiently afforded a variety of arylated o-alkylbenzaldehydes and polycyclic aromatic hydrocarbons (PAHs) in one pot, exhibiting high functional group tolerance with broad substrate scope. The
Tf2O-catalyzed Friedel–Crafts alkylation to synthesize dibenzo[a,d]cycloheptene cores and application in the total synthesis of Diptoindonesin D, Pauciflorial F, and (±)-Ampelopsin B
作者:Gang-Wei Wang、Hong-Li Wang、David A. Capretto、Qi Han、Rong-Bin Hu、Shang-Dong Yang
DOI:10.1016/j.tet.2012.03.073
日期:2012.7
By using Tf2O as a catalyst, we have developed a protocol for the preparation of various dibenzo[a,d]cycloheptene cores via Friedel–Crafts alkylation. Using this method as the key step, we also present concise and useful routes to synthesize the natural products Diptoindonesin D, Pauciflorial F, and (±)-Ampelopsin B. Notably, this process exhibited following very attractive features: (i) the process