Bi(III)盐在无溶剂条件下催化温和高效合成苯并恶唑,苯并噻唑,苯并咪唑和恶唑并[4,5- b ]吡啶
摘要:
一系列苯并恶唑,苯并噻唑,苯并咪唑,和恶唑并[4,5- b ]吡啶化合物是有效地从的反应合成 Ò 氨基苯酚, ö -aminothiophenol, ø 苯二胺类,和2-氨基-3-羟基吡啶与所述原酸酯存在催化量的Bi(III)盐,例如Bi( TFA )3,Bi(O Tf )3和BiOClO 4 · x H 2O在无溶剂条件下。该新方案的显着特征是高转化率,非常短的反应时间,在无溶剂条件下更干净的反应曲线,简单的操作步骤以及使用相对无毒的催化剂。
exhibit outstanding levels of selectivity in reactions of donor/acceptor and donor/donor carbenes; at the same time, the reaction rates are much faster and the substrate scope is considerably wider than those of previous generations of chiral [BiRh] catalysts. As shown by a combined experimental, crystallographic, and computational study, the new catalysts draw their excellent application profile largely
Chiral Heterobimetallic Bismuth-Rhodium Paddlewheel Catalysts: A Conceptually New Approach to Asymmetric Cyclopropanation
作者:Lee R. Collins、Sebastian Auris、Richard Goddard、Alois Fürstner
DOI:10.1002/anie.201900265
日期:2019.3.11
donor–acceptor carbenes formed in situ are significantly more enantioselective when catalyzed by the heterobimetallic bismuth–rhodium complex 5 a endowed with N‐phthalimido tert‐leucine paddlewheel ligands rather than by its homobimetallic dirhodium analogue 1 a. This virtue is likely the result of two synergizing factors: the conical shape of 5 a translates into a narrower calyx‐like chiral binding
A New Methodology for Synthesis of Aryl Bismuth Compounds: Arylation of Bismuth(III) Carboxylates by Sodium Tetraarylborate Salts
作者:Vitalie Stavila、John H. Thurston、Darío Prieto-Centurión、Kenton H. Whitmire
DOI:10.1021/om7009667
日期:2007.12.1
Sodium tetraarylborate salts Na[BAr4] (Ar = C6H5 (Ph), C6H4-Me-4 (tolyl), C6H4-F-4) are found to be efficient arylating species for a range of bismuth(III) aromatic and aliphatic carboxylates including Bi(Hsal*)3 (Hsal* = 2-HO-C6H4CO2− (Hsal); 4-Me-2-HO-C6H3CO2− (Hsal4Me); or 3-MeO-2-HO-C6H3CO2− (Hsal3OMe)) and Bi(O2CR)3 (R = Me, CMe3, and CF3) to produce triaryl bismuth compounds. The reactions may
发现四芳基硼酸钠盐Na [BAr 4 ](Ar = C 6 H 5(Ph),C 6 H 4 -Me-4(甲苯基),C 6 H 4 -F-4)在一定范围内是有效的芳基化物种。铋(III)的芳族和脂族羧酸盐,包括铋(Hsal *)3(Hsal * = 2-HO-C 6 H ^ 4 CO 2 -(Hsal); 4-ME-2-HO-C 6 H ^ 3 CO 2 -(Hsal 4Me);或3-的MeO-2-HO-C 6 H ^ 3 CO 2 -(Hsal 3OMe))和Bi(O 2 CR)3(R = Me,CMe 3和CF 3)生成三芳基铋化合物。反应可以在乙醇,四氢呋喃或丙酮中进行。芳基铋双(水杨酸酯)BiPh(Hsal)2和Bi(甲苯基)(Hsal)2在回流的THF中表现出相似的反应性,可用于生产混合的芳基双变BiBi x(甲苯基)3- x。红外光谱,X射线晶体学,核磁共振光谱(1 H,11 B,13
Rational Syntheses, Structure, and Properties of the First Bismuth(II) Carboxylate
作者:Evgeny V. Dikarev、Bo Li
DOI:10.1021/ic049937h
日期:2004.5.1
Bismuth(II) trifluoroacetate (1), the first inorganic salt of bismuth in oxidation state +2, has been obtained in its pure, unstabilized form. Several synthetic routes suggested for the isolation of the new compound include (i) mild oxidation of elemental bismuth with some metal trifluoroacetates, e.g., Ag(I) and Hg(II); (ii) mild reduction of bismuth(III) trifluoroacetate with metals, such as Zn;