Synthesis of Aryl Ethers from Benzoates through Carboxylate-Directed CH-Activating Alkoxylation with Concomitant Protodecarboxylation
作者:Sukalyan Bhadra、Wojciech I. Dzik、Lukas J. Gooßen
DOI:10.1002/anie.201208755
日期:2013.3.4
copper/silver bimetallic catalyst system, aromatic carboxylate salts undergo ortho CH alkoxylation with concomitant loss of the carboxylate directing group in a protodecarboxylation step (see scheme, FG=functional group). This process provides a convenient synthetic access to the important class of aromatic ethersfrom widely available carboxylic acids.
Chloroboration and allied reactions of unsaturated compounds II. Haloboration and phenylboration of acetylenes; and the preparation of some alkynylboranes
作者:M.F. Lappert、B. Prokai
DOI:10.1016/s0022-328x(00)80030-3
日期:1964.3
alcoholysis, and by their infrared spectra. For unsymmetrical acetylenes. Markownikoff addition was demonstrated; the steric course of reaction is trans for acetylene but is believed to be cis for at least some of the substituted acetylenes. Reactivity increases with high acceptor strength of borane and high nucleophilicity of the acetylene. Chloro- and organoboration of acetylenes is evidently a thermody
选定的卤代烷酮BX 1 X 2 X 3(X 1 = Cl或Br,X 2和X 3为= X 1或Ph),通常与乙炔(HCCH,BuCCH,PhCCH或取决于乙炔的性质,得到(2-卤代或2-苯基烯基)硼烷。产物的特征在于乙酰分解原脱硼,醇解及其红外光谱。用于不对称乙炔。展示了Markownikoff的添加;对于乙炔来说,空间反应过程是反式的,但据信是顺式的对于至少一些取代的乙炔。反应性随硼烷的高受体强度和乙炔的高亲核性而增加。与氢硼化相反,乙炔的氯硼化和有机硼化显然是热力学控制的过程。
Über eine einfache Merocyanine aus enolisierbaren 1,3-Diketonen
作者:W. Jenny
DOI:10.1002/hlca.19510340218
日期:——
1. DurchKondensationvon 2-Aceto-naphtol-(1) und 2-Acetyl-3-oxythionaphten mitAldehyden bei Gegenwart von Borpyroacetat wurden tieffarbige Borkomplexe erhalten.
Synthesis and structural elucidation of some new heterocyclic β-diketone derivatives of boron
作者:Yash Pal Singh、A.K. Rai
DOI:10.1016/s0277-5387(00)84649-5
日期:1984.1
Some new β-diketone derivatives of boron having the general formula B2O(OAc)4−n[OC(R) CH3]n (where n = 1 or 2; R = CH3, C2H5, C6H5 and p-ClC6H4) have been synthesised by the reactions of oxy-bis(diacetatoborane) and substituted pyrazolones, such as 4-acyl-3-methyl-1-phenyl-2-pyrazolin-5-ones (acyl = acetyl, propionyl, benzoyl and p-chlorobenzoyl) in dry toluene solution in 1:1 and 1:2 molar ratios
一些通式为B 2 O(OAc)4− n [OC(R)CH 3 ] n(其中n = 1或2; R = CH 3,C 2 H 5,C 6的硼的新β-二酮衍生物H 5和p -ClC 6 H 4)是通过氧双(diacetatoborane)与取代的吡唑啉酮如4-酰基-3-甲基-1-苯基-2-吡唑啉-5-酮(酰基=乙酰基,丙酰基,苯甲酰基和p(氯苯甲酰基)在无水甲苯溶液中的摩尔比为1:1和1:2。这些衍生物已经通过元素分析,分子量测量来表征。根据化学反应,IR,1 H和11 B NMR光谱研究提出了结构。
A stereoselective approach to the angucyclinone antibiotics: A total synthesis of the C-1 epimer of (±)-rubiginone B1
作者:David S. Larsen、Michael D. Ośhea
DOI:10.1016/s0040-4039(00)91799-4
日期:1993.2
A stereoselective Lewis acid-promoted cycloaddition reaction of 5-hydroxy-1,4-naphthoquinone and dienol (12) gave a key intermediate (14) which was transformed into the title compound (18) in 35% overall yield.