Oxidation of Hydroxyl-Substituted Organotrifluoroborates
摘要:
Potassium- and tetra-n-butylammonium organotrifluoroborates containing hydroxyl groups have been prepared and oxidized using several common oxidants. Aryl-, alkenyl-, and alkyltrifluoroborates containing both primary and secondary hydroxyl groups were oxidized in moderate to excellent yields with complete retention of the trifluoroborate moiety. The utility of these oxidized products was demonstrated in a Suzuki-Miyaura cross-coupling reaction.
Oxidation of Hydroxyl-Substituted Organotrifluoroborates
摘要:
Potassium- and tetra-n-butylammonium organotrifluoroborates containing hydroxyl groups have been prepared and oxidized using several common oxidants. Aryl-, alkenyl-, and alkyltrifluoroborates containing both primary and secondary hydroxyl groups were oxidized in moderate to excellent yields with complete retention of the trifluoroborate moiety. The utility of these oxidized products was demonstrated in a Suzuki-Miyaura cross-coupling reaction.
Nickel-Catalyzed Cross-Coupling of Potassium Aryl- and Heteroaryltrifluoroborates with Unactivated Alkyl Halides
作者:Gary A. Molander、O. Andreea Argintaru、Ioana Aron、Spencer D. Dreher
DOI:10.1021/ol102717x
日期:2010.12.17
A method for the cross-coupling of alkyl electrophiles with various potassium aryl- and heteroaryltrifluoroborates has been developed. Nearly stoichiometric amounts of organoboron species could be employed to cross-couple a large variety of challenging heteroaryl nucleophiles. Several functional groups were tolerated on both the electrophilic and the nucleophilic partners. Chemoselective reactivity of C(sp(3))-Br bonds in the presence of C(sp(2))-Br bonds was achieved.
Linchpin Synthons: Metalation of Aryl Bromides Bearing a Potassium Trifluoroborate Moiety
作者:Gary A. Molander、Noel M. Ellis
DOI:10.1021/jo061324u
日期:2006.9.1
Aryl bromides bearing a potassium trifluoroborate moiety were subjected to lithium-halogen exchange at low temperature using a variety of alkyllithium reagents. A number of different electrophiles were evaluated in their reactions with the aryllithiums produced therein. Under carefully optimized conditions, potassium bromophenyl trifluoroborates afforded good to excellent yields of the corresponding alcohols (64-94% isolated yield) when aldehydes or ketones were used as the electophilic partner. Esters were unfortunately found to be unreactive.
Oxidation of Hydroxyl-Substituted Organotrifluoroborates
作者:Gary A. Molander、Daniel E. Petrillo
DOI:10.1021/ja062974i
日期:2006.8.1
Potassium- and tetra-n-butylammonium organotrifluoroborates containing hydroxyl groups have been prepared and oxidized using several common oxidants. Aryl-, alkenyl-, and alkyltrifluoroborates containing both primary and secondary hydroxyl groups were oxidized in moderate to excellent yields with complete retention of the trifluoroborate moiety. The utility of these oxidized products was demonstrated in a Suzuki-Miyaura cross-coupling reaction.