Expanding Organoboron Chemistry: Epoxidation of Potassium Organotrifluoroborates
作者:Gary A. Molander、María Ribagorda
DOI:10.1021/ja0351140
日期:2003.9.1
Most organoboron reagents are highly susceptible to oxidation by a variety of oxidants. In these processes, the valuable carbon-boron bond is cleaved. The organotrifluoroborates examined in this contribution appear resistant to many common oxidants. Consequently, thioether-substituted alkyltrifluoroborates can be oxidized to the corresponding sulfones, while retaining the trifluoroborate moiety. 1
gold-catalyzed C(sp3)–C(sp2) Suzuki–Miyaura coupling reaction facilitated by ligand-enabled Au(I)/Au(III) redox catalysis was developed. The cross-coupling of alkylorganometallics was first realized in the redox catalytic cycle in gold chemistry, without the use of external oxidants. This gold-catalyzed C(sp3)–C(sp2) coupling reaction allows a variety of alkyl chain and useful methyl trifluoroborates to react
<i>B</i>-Alkyl Suzuki−Miyaura Cross-Coupling Reactions with Air-Stable Potassium Alkyltrifluoroborates
作者:Gary A. Molander、Chang-Soo Yun、María Ribagorda、Betina Biolatto
DOI:10.1021/jo0343331
日期:2003.7.1
palladium-catalyzed cross-coupling reaction of substitutedpotassium alkyltrifluoroborates with arylhalides and aryl triflates proceeds readily with moderate to good yields. The potassium alkyltrifluoroborates 1, 2, and 3a-e were easily synthesized and obtained as air-stable crystalline solids that can be stored for long periods of time. All of the cross-couplings proceed under the same reaction conditions using PdCl(2)(dppf)
Coupling of Trifluoroacetaldehyde <i>N</i>-Triftosylhydrazone with Organoboronic Acids for the Synthesis of <i>gem</i>-Difluoroalkenes
作者:Yu Ma、Bhoomireddy Rajendra Prasad Reddy、Xihe Bi
DOI:10.1021/acs.orglett.9b03740
日期:2019.12.20
synthesis of alkyl gem-difluoroalkenes remains a difficult task in organic synthesis. Here, we report a general and efficient approach for tackling this problem by gem-difluoroolefination of trifluoroacetaldehyde N-triftosylhydrazone with organoboronic acids. This protocol is operationally simple, free of transition metals, and suitable for a broad range of organoboronic acids. Moreover, the utility