Enantioselective Palladium-Catalyzed Carbozincation of Cyclopropenes
摘要:
A highly enantioselective palladium-catalyzed carbozincation of cyclopropenes has been developed. The intermediate cyclopropylzinc species, after transmetalation with copper, were trapped with various electrophiles. This one-pot procedure furnished functionalizied cyclopropenes with excellent diastereo- and enantioselectivity.
作者:Allison K. Griffith、Christine M. Vanos、Tristan H. Lambert
DOI:10.1021/ja309650u
日期:2012.11.14
The development of a catalytic carbonyl-olefin metathesis strategy is reported, in the context of the ring-opening metathesis of cyclopropenes with aldehydes using a,simple hydrazine catalyst The key to this reaction is 4 conceptual blueprint for metathesis chemistry that forgoes the traditional reliance on [2 + 2] cycloaddition modes in favor of a [3 + 2] paradigm.