Ullmann coupling reaction of 1,3-bistriflate esters of calix[4]arenes: facile syntheses of monoaminocalix[4]arenes and 4,4′:6,6′-diepithiobis(phenoxathiine)
摘要:
Treatment of 1,3-bistriflate esters of thiacalix- (6a) and calix[4]arenes 6b with benzylamine in the presence of Cul and K3PO4 results in the displacement of a TfO moiety with a benzylamino group, which provides an easy access to monoaminothiacalix(4]arene 4a and its methylene-bridged counterpart 4b. On the other hand, the reaction of 6a in the absence of benzylamine leads to intramolecular dietherification, giving 4,4':6,6'-diepithiobis(phenoxathiine) 7a. (C) 2007 Elsevier Ltd. All rights reserved.
instead of the hydroxy group(s) at the 28-position or at both the 26- and 28-positions of p-tert-butylcalix[4]arene (1a) and p-tert-butylthiacalix[4]arene (1b), via the Ullmann-type amination or amidation. Thus, the copper-catalyzed or mediated amination of the 1,3-bistriflate ester (2a) of 1a with benzylamine affords either mono(benzylamino) triflate 7a or 1,3-bis(benzylamine) 8 in a high yield, depending
Intramolecular rearrangement of 1,3-bistriflate ester of thiacalix[4]arene to 1,2-counterpart: an efficient di-O-protection method for the stereoselective synthesis of anti-1,2-diethers
anti-selective dialkylation of the proximal hydroxygroups of thiacalix[4]arene 2 is achieved for the first time via the initial protection of the two proximal hydroxygroups of compound 2 with Tf moieties by intramolecular rearrangement of easily preparable 1,3-bistriflate ester 3 to 1,2-counterpart 4, followed by anti-selective dialkylation of the remaining hydroxygroups with alkyl halides or under the Mitsunobu
Ullmann coupling reaction of 1,3-bistriflate esters of calix[4]arenes: facile syntheses of monoaminocalix[4]arenes and 4,4′:6,6′-diepithiobis(phenoxathiine)
Treatment of 1,3-bistriflate esters of thiacalix- (6a) and calix[4]arenes 6b with benzylamine in the presence of Cul and K3PO4 results in the displacement of a TfO moiety with a benzylamino group, which provides an easy access to monoaminothiacalix(4]arene 4a and its methylene-bridged counterpart 4b. On the other hand, the reaction of 6a in the absence of benzylamine leads to intramolecular dietherification, giving 4,4':6,6'-diepithiobis(phenoxathiine) 7a. (C) 2007 Elsevier Ltd. All rights reserved.
Reactions of thiacalix[4]arene 1,3-bistriflate: formation of thiacalix[2]phenoxathiins—structural and complexation studies
作者:Almeqdad Habashneh、Chester R. Jablonski、Julie Collins、Paris E. Georghiou
DOI:10.1039/b801483c
日期:——
Reaction of the 1,3-bistriflate of thiacalix[4]arene 2 under various conditions including typical Sonogashira and other basic conditions with CuI, afforded a mixture of hydrolysis and rearrangement products including a bis(phenoxathiin) 3 reported also by Hattori and co-workers. An unprecedented displacement of a narrow-rim triflate by a hydrogen atom to form a new partial conethiacalixarene 2i is reported as are five new X-ray crystal structures. The de-tert-butylated analogue 3a was synthesized from 3 and their complexation properties with Ag+ and Hg2+ are also reported.
硫杂[4]炔 2 的 1,3-二三叉酯在各种条件下(包括典型的 Sonogashira 和其他基本条件)与 CuI 反应,产生了水解和重排产物的混合物,其中包括 Hattori 及其合作者也报道过的双(吩噁噻)3。据报道,一种前所未有的窄边三酸酯被一个氢原子置换,形成了一种新的部分共硫杂堇青霉烯 2i,同时还发现了五种新的 X 射线晶体结构。从 3 合成了去叔丁基类似物 3a,并报道了它们与 Ag+ 和 Hg2+ 的络合性质。