Facially Selective Cu-Catalyzed Carbozincation of Cyclopropenes Using Arylzinc Reagents Formed by Sequential I/Mg/Zn Exchange
摘要:
Described is a Cu-catalyzed directed carbozincation of cyclopropenes with organozinc reagents prepared by I/Mg/Zn exchange. This protocol broadens the scope with respect to functional group tolerance and enables use of aryl iodide precursors, rather than purified diorganozinc precursors. Critical to diastereoselectivity of the carbozincation step is the removal of magnesium halide salts after transmetalation with ZnCl2.
COPPER-CATALYZED ELECTROPHILIC AMINATION OF DIORGANOZINC REAGENTS: 4-PHENYLMORPHOLINE
作者:Berman, Ashley M.、Johnson, Jeffrey S.、Nora, George、Miller, Marvin J.
DOI:10.15227/orgsyn.083.0031
日期:——
Synthesis of Polyfunctional Diorganomagnesium and Diorganozinc Reagents through In Situ Trapping Halogen–Lithium Exchange of Highly Functionalized (Hetero)aryl Halides in Continuous Flow
作者:Marthe Ketels、Maximilian A. Ganiek、Niels Weidmann、Paul Knochel
DOI:10.1002/anie.201706609
日期:2017.10.2
Go with the flow: A halogen–lithium exchange using BuLi or PhLi was performed in the presence of various metal salts (ZnCl2, MgCl2⋅LiCl) on a broad range of sensitive bromo- or iodo(hetero)arenes using a commercially available continuous-flow setup. The resulting diarylmagnesium or diarylzinc species were trapped with various electrophiles to give polyfunctional (hetero)arenes in high yields and with
Facially Selective Cu-Catalyzed Carbozincation of Cyclopropenes Using Arylzinc Reagents Formed by Sequential I/Mg/Zn Exchange
作者:Vinod Tarwade、Ramajeyam Selvaraj、Joseph M. Fox
DOI:10.1021/jo3019076
日期:2012.11.2
Described is a Cu-catalyzed directed carbozincation of cyclopropenes with organozinc reagents prepared by I/Mg/Zn exchange. This protocol broadens the scope with respect to functional group tolerance and enables use of aryl iodide precursors, rather than purified diorganozinc precursors. Critical to diastereoselectivity of the carbozincation step is the removal of magnesium halide salts after transmetalation with ZnCl2.