据报道,环溴化长链2-烷氧基噻吩的合成涉及容易制备的2-噻吩基三氟硼酸盐的温和(Oxone)氧化,然后进行Mitsunobu醚化。两种方法在操作上都很简单,并且使用廉价的试剂。使用这种方法,制备了几种新颖的具有以前难以捉摸的取代方式的单溴和二溴辛基氧基噻吩。一种这样的化合物被修饰为新型的5-烷氧基噻吩并[3,2- b ]噻吩-2-羧酸酯,这标志着该化合物家族的首次合成。
据报道,环溴化长链2-烷氧基噻吩的合成涉及容易制备的2-噻吩基三氟硼酸盐的温和(Oxone)氧化,然后进行Mitsunobu醚化。两种方法在操作上都很简单,并且使用廉价的试剂。使用这种方法,制备了几种新颖的具有以前难以捉摸的取代方式的单溴和二溴辛基氧基噻吩。一种这样的化合物被修饰为新型的5-烷氧基噻吩并[3,2- b ]噻吩-2-羧酸酯,这标志着该化合物家族的首次合成。
Organocatalyzed Asymmetric Conjugate Addition of Heteroaryl and Aryl Trifluoroborates: a Synthetic Strategy for Discoipyrrole D
作者:Jiun‐Le Shih、Thien S. Nguyen、Jeremy A. May
DOI:10.1002/anie.201503528
日期:2015.8.17
Bis‐heteroaryl or bis‐aryl stereocenters were formed by an organocatalytic enantioselective conjugateaddition using the respective trifluoroborate salts as nucleophiles. Control studies suggested that fluoride dissociation is necessary in the anhydrous conditions. This strategy is applicable to the synthesis of discoipyrroleD, an inhibitor of BR5 fibroblast migration.
An efficient ligand-free Pd(OAc)2-catalyzed selectivearylation of pyridine N-oxides using potassium (hetero)aryltrifluoroborates as coupling partners via C–H bond activation was achieved in the presence of TBAI. This approach has a broad substrate scope and shows moderate to high yields.
A simple catalytic system based on PdCl2(CH3CN)2 in water for cross-coupling reactions using diazonium salts
作者:Ouissam El Bakouri、Martí Fernández、Sandra Brun、Anna Pla-Quintana、Anna Roglans
DOI:10.1016/j.tet.2013.09.010
日期:2013.11
obtained through the Suzuki–Miyaura cross-coupling reactions between diazoniumsalts and potassium trifluoroborates using PdCl2(CH3CN)2 as the catalyst in water and in the absence of any additive, ligand or base. In addition, the same mild catalytic system is effective for the Matsuda–Heck reaction between several monoolefins with aryldiazonium salts.
Enantioselective synthesis of α-amino esters through Petasis borono-Mannich multicomponent reaction of potassium trifluoroborate salts
作者:Mengnan Tong、Xiang Bai、Xin Meng、Jianfei Wang、Tao Wang、Xingyi Zhu、Bin Mao
DOI:10.1177/1747519819876822
日期:2019.11
Enantioselective synthesis of α-amino esters have been achieved through the Petasisborono-Mannich multicomponent reaction using (R)-BINOL-derived catalysts with stable heteroaryl and alkenyl trifluoroborate salts under mild conditions. The reaction provides direct access to optically active α-amino esters with moderate to good yields and enantioselectivities.
Design and synthesis of furyl/thineyl pyrroloquinolones based on natural alkaloid perlolyrine, lead to the discovery of potent and selective PDE5 inhibitors
Based on perlolyrine (1), a natural alkaloid with weak PDE5 potency from the traditional Chinese aphrodisiac plant Tribulus terrestris L., a series alpha-substituted tetrahydro-beta-carboline (TH beta C) derivatives were synthesized via T(+)BF4(-)-mediated oxidative C-H functionalization of N-aryl TH beta Cs with diverse potassium trifluoroborates. Following Winterfeldt oxidation afforded the corresponding furyl/thienyl pyrroloquinolones, of which 5-ethylthiophene/ethylfuran derivatives 20a-b were identified as the most potent and selective PDE5 inhibitors. Among the enantiomers, (S)-20a and (S)-20b (IC50 = 0.52 and 0.39 nM) were found to be more effective than their (R)-antipode, display favorable pharmacokinetic profiles, exert in vitro vasorelaxant effects on the isolated thoracic aorta, and exhibit in vivo efficacy in the anesthetized rabbit erectile model. (C) 2018 Elsevier Masson SAS. All rights reserved.