2-Pyridyl and 3-pyridylzinc bromides: direct preparation and coupling reaction
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/j.tet.2010.02.061
日期:2010.4
A facile synthetic approach to the direct preparation of 2-pyridyl and 3-pyridylzinc bromides has been demonstrated usingRieke zinc with 2-bromopyridine and 3-bromopyridine, respectively. A variety of different electrophiles have been coupled with the resulting organozinc reagents to give the corresponding cross-coupling products in moderate to good yields.
versatile tool for the construction of (hetero)biaryl scaffolds. However, the cross-electrophile coupling using abundant (hetero)arylhalides and pseudohalides is still in its infancy. In particular, a robust and general method for the cross-electrophile coupling would allow unparalleled entry into the vast collection of commercially available, structurally diverse (hetero)arylhalides and pseudohalides
作者:Brian T. O'Neill、Daniel Yohannes、Mark W. Bundesmann、Eric P. Arnold
DOI:10.1021/ol0067538
日期:2000.12.1
benzylation and then reduction of a pyridinium ring. The penultimate diazabicyclo[3.3.1]nonane intermediate was obtained with high diastereoselectivity. A similar sequence has been employed for the synthesis of novel derivative 9-methoxycytisine.