The constitution of the dimers of 4,6-di-t-butyl-3-hydroxy-o-benzoquinone and 5-t-butyl-3-hydroxy-o-benzoquinone
作者:N. M. Waldron
DOI:10.1039/j39680001914
日期:——
Evidence is presented which shows that the yellow and white dimers of 4,6-di-t-butyl-3-hydroxy-o-benzoquinone are structures 3,4a,6,8-tetra-t-butyl-4a, 10a-dihydro-9,10a-dihydroxydibenzo-p-dioxin-1,2-dione (II) and 2,3a,5,7-tetra-t-butyl-3a,10a-dihydro-8,10a-dihydroxybenzo[b]cyclopenta[f][1,4]dioxepin-1,10-dione (IV), respectively. The suggested position of substitution of the t-butyl group in 5-t-butylpyrogallol
提出的证据表明4,6-二叔丁基-3-羟基-邻苯醌的黄色和白色二聚体是结构3,4a,6,8-四叔丁基-4a,10a-二氢-9,10a-二羟基二苯并-对二恶英-1,2-二酮(II)和2,3a,5,7-四叔丁基-3a,10a-二氢-8,10a-二羟基苯并[ b ]环戊[分别为f ] [1,4] dioxepin-1,10-dione(IV)。已经证实了叔丁基在5-叔丁基邻苯三酚中的取代位置,从而确定了5-叔丁基-3-羟基-邻苯醌的二聚体为5,10-二叔丁基- 2,7-二羟基三环-[5,3,1,1 2,6] dodeca-4,9-二烯-3,8,11,12-四酮(XIII)。在制备5-叔丁基间苯三酚中,使用了新的反应序列以原位连接叔丁基。
Synthesis and Functionalization of Inherently Chiral Tetraoxacalix[2]arene[2]pyridines
作者:Shuai Pan、De-Xian Wang、Liang Zhao、Mei-Xiang Wang
DOI:10.1021/ol303019q
日期:2012.12.21
Inherently chiral tetraoxacalix[2]arene[2]pyridines containing C2 symmetry were synthesized efficiently from a macrocyclic condensation reaction of resorcinol derivatives with 2,6-dichloro-3-nitropyridine in a one-potreaction manner, while tetraoxacalix[2]arene[2]pyridine with an ABCD-substitution pattern was prepared in a good yield by means of a stepwise fragment coupling approach. Postmacrocyclization
transfer, number of radicalsscavenged per antioxidant molecule, BDE and formation of antioxidant dimers from the primary radicals play an important role regarding the antioxidantactivity of phenols. Based on this, it is finally shown that myricetin, rosmarinic and carnosic acids are more efficient than α-tocopherol and synthetic antioxidants for the preservation of omega-3 oils.
The oxidationproducts of a number of 4- and 5-monosubstituted and 4,6-disubstituted pyrogallols are discussed. 4-Alkylpyrogallols yield the corresponding 4′,7-dialkylpurpurogallins and the structures of the products resulting from the further oxidation of these compounds with alkaline hydrogen peroxide are elucidated. Oxidation of 5-mono and 4,6-dialkylpyrogallol derivatives yield characteristic white
PENAM DERIVATIVES FOR TREATING BACTERIAL INFECTIONS
申请人:TenNor Therapeutics Limited
公开号:US20210070774A1
公开(公告)日:2021-03-11
Novel iron chelating group conjugated penam derivatives described herein show antibacterial activity, and could be used as antibacterial agents or beta-lactamase inhibitors (BLIs) which are of value for application in combination with other antibacterial agents.