Highly Selective Reactions of Unbiased Alkenyl Halides and Alkylzinc Halides: Negishi-Plus Couplings
摘要:
High yielding stereo- and chemoselective Pd-catalyzed cross-couplings In THF at room temperature of alkenyl iodides and bromides with primary and secondary alkyl zinc iodides have been developed with the aid of N-methylmidazole as the key additive.
Ligand Effects on Negishi Couplings of Alkenyl Halides
作者:Arkady Krasovskiy、Bruce H. Lipshutz
DOI:10.1021/ol2010165
日期:2011.8.5
Negishi couplings at olefinic centers do not always occur with the anticipated maintenance of stereochemistry. The source of erosion has been traced to the ligand, and a modified method has been developed that solves the stereochemical issue and significantly improves yields of Negishi couplings in general.