Facile Preparation of Fluorine-containing Alkenes, Amides and Alcohols via the Electrophilic Fluorination of Alkenyl Boronic Acids and Trifluoroborates
Microwave-enhanced cross-coupling of allyl chlorides with vinyltrifluoroborates
作者:George W. Kabalka、Eric Dadush、Mohammad Al-Masum
DOI:10.1016/j.tetlet.2006.08.043
日期:2006.10
The allylation of potassium alkenyltrifluoroborates with allyl chloride via a palladiumcatalyzedcross-couplingreaction occurs rapidly undermicrowaveirradiation. The allylation reaction produces 1,4-pentadienes in high yields.
Branched Amine Synthesis via Aziridine or Azetidine Opening with Organotrifluoroborates by Cooperative Brønsted/Lewis Acid Catalysis: An Acid-Dependent Divergent Mechanism
作者:Truong N. Nguyen、Jeremy A. May
DOI:10.1021/acs.orglett.8b01394
日期:2018.6.15
A practical catalytic method to synthesize β,β- and γ,γ-substituted amines by opening aziridines and azetidines, respectively, using alkenyl, alkynyl, or aryl/heteroaryl trifluoroborate salts is described. This reaction features simple open-flask reaction conditions, the use of transition-metal-free catalysis, complete regioselectivity, and high diastereoselectivity. Preliminary mechanistic studies
Brønsted Acid Catalyzed Homoconjugate Addition of Organotrifluoroborates to Arylated Cyclopropyl Ketones
作者:Truong N. Nguyen、Thien S. Nguyen、Jeremy A. May
DOI:10.1021/acs.orglett.6b01795
日期:2016.8.5
A novel and practical homoconjugate addition of alkenyl, alkynyl, heteroaryl, and aryl trifluoroborates to arylated cyclopropylketones to synthesize γ,γ-disubstituted ketones is reported. A preliminary mechanistic proposal involving ketone protonation, an intermediary carbocation, and intermolecular nucleophile addition has been made based on control studies.
Iron(II)-Catalyzed Trifluoromethylation of Potassium Vinyltrifluoroborates
作者:Andrew T. Parsons、Todd D. Senecal、Stephen L. Buchwald
DOI:10.1002/anie.201108267
日期:2012.3.19
2‐heteroarylvinyl‐substituted substrates with E/Z selectivities of more than 95:5. Experimental observations suggest that the reaction does not proceed through a transmetalation of the RBF3K species to the iron catalyst.
用CF 3交换BF 3 :标题反应在极其温和的反应条件下进行,并提供2-芳基乙烯基-和2-杂芳基乙烯基-取代的底物,其E / Z选择性大于95:5。实验观察表明,该反应不是通过 RBF 3 K 物质向铁催化剂的金属转移来进行的。
Lewis acid promoted Mannich type reactions of α,α-dichloro aldimines with potassium organotrifluoroborates
作者:Sara Stas、Kourosch Abbaspour Tehrani
DOI:10.1016/j.tet.2007.06.003
日期:2007.9
Potassium phenylethynyltrifluoroborate and potassium styryltrifluoroborates react with α,α-dichlorinated aldimines in the presence of BF3·OEt2 as a Lewis acid to give a new stable class of functionalized propargylamines and allylamines. The use of hexafluoroisopropanol as a co-solvent in this modified Petasis reaction allows high yield isolation of the target compounds.