1,5,7-三羟基-6 H-茚并[1,2 - b ]蒽-6,11,13-三酮(1),被认为是抗结核天然产物桉树三酮,已以43%的总收率合成,六个步骤,包括一个关键的Suzuki-Miyaura联芳基偶联和一个定向的远程金属化(DReM)启动的环化反应。的物理和光谱性质1不匹配报道的天然产物中的数据。此时,没有足够的可用信息来进行结构重新分配。在优化Suzuki-Miyaura偶联过程中,观察到与硼酸酯基团邻位的空前联芳基偶联。已经研究了这种异常反应的范围。
[EN] METHOD TO PREPARE PHENOLICS FROM BIOMASS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE COMPOSÉS PHÉNOLIQUES À PARTIR DE BIOMASSE
申请人:TNO
公开号:WO2016114668A1
公开(公告)日:2016-07-21
The present invention is directed to a method for preparing a final phenolic product from biomass comprising the steps of providing a furanic compound obtainable from biomass; reacting the furanic compound with a dienophile to obtain a phenolic compound; reacting the phenolic compound further to obtain the final phenolic product.
FeCl3-catalyzed convenient synthesis of 3-hydroxyphthalates has been achieved by a Diels–Alderreaction of furans with dimethylacetylenedicarboxylate, followed by ring-opening aromatization reaction of the Diels–Alder adducts, 7-oxabicyclo[2.2.1]hepta-2,5-diene derivatives. In addition, 7-azabicyclo[2.2.1]hepta-2,5-diene derivative, derived from N-Boc-pyrrole and dimethylacetylenedicarboxylate, also converted
Rhodium-Catalyzed Asymmetric Cyclodimerization of Oxabenzonorbornadienes and Azabenzonorbornadienes: Scope and Limitations
作者:Anna Allen、Paul Le Marquand、Ryan Burton、Karine Villeneuve、William Tam
DOI:10.1021/jo7012884
日期:2007.10.1
Cationic rhodium(I)-catalyzed cyclodimerization of oxabenzonorbornadienes produced naphtho[1,2-b]furan ring systems in a single step with excellent yields and excellent enantioselectivities. The effect of various Rh(I) catalysts, Ag(I) salts, solvents, and phosphine ligands on the yield and enantioselectivity of the reaction was investigated, and the scope and limitations of this reaction with various
阳离子铑(I)催化的氧杂苯并降冰片二烯环二聚反应可一步合成萘[1,2- b ]呋喃环系统,并具有优异的收率和出色的对映选择性。研究了各种Rh(I)催化剂,Ag(I)盐,溶剂和膦配体对反应收率和对映选择性的影响,并研究了该反应与各种恶双环烯的范围和局限性。用氮杂苯并降冰片二烯类似物获得了相似的结果,以优异的产率和优异的对映选择性提供了相应的环二聚产物。
Method to prepare phenolics from biomass
申请人:Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO
公开号:US10407376B2
公开(公告)日:2019-09-10
The present invention is directed to a method for preparing a final phenolic product from biomass comprising the steps of providing a furanic compound obtainable from biomass; reacting the furanic compound with a dienophile to obtain a phenolic compound; reacting the phenolic compound further to obtain the final phenolic product.
Photochemical and acid-catalyzed dienone-phenol rearrangements. The effect of substituents on the regioselectivity of 1,4-sigmatropic rearrangements of the type A intermediate
作者:Arthur G. Schultz、Steven A. Hardinger
DOI:10.1021/jo00003a037
日期:1991.2
Birch reduction of isophthalic acid and 3-cyanobenzoic acid followed by (1) methylation of the resulting enolate with methyl iodide and (2) esterification with diazomethane provided 2-carbomethoxy- and 2-cyano-6-methyl-6-carbomethoxy-1,4-cyclohexadienes 9 and 25. Type A photorearrangements of a series of 2-carbomethoxy-, 2-cyano-, 2-methoxy-, and 2-methyl-4-carbomethoxy-4-methyl-2,5-cyclohexadien-1-ones 11, 26, 45a, and 45b gave 4-carbomethoxy-3-methyl-2-substituted-phenols 12, 28, 46, and 31. It has been demonstrated that the regioselectivity of type A photorearrangement of C(2) substituted 2,5-cyclohexadien-1-ones is governed by electronic rather than steric effects to give the intermediate C(1) rather than C(3) substituted bicyclo [3.1.0(1,5)]hex-3-en-2-ones. Regioselectivities of the acid-catalyzed dienone-phenol rearrangements of C(2) substituted 2,5-cyclohexadienones 11, 45a, and 45b appear to be dependent upon the relative stabilities of carbocations resulting from migration of the C(4) carbomethoxy group.