Cobalt-Mediated Diastereoselective Cross-Coupling Reactions between Cyclic Halohydrins and Arylmagnesium Reagents
摘要:
Cyclic TBS-protected iodohydrins (and bromohydrins) undergo a highly diastereoselective cross-coupling with various aryl- and heteroarylmagnesium reagents in the presence of THF-soluble CoCl2.2LiCl and TMEDA as a ligand leading to trans-2-arylcyclohexanol derivatives in good yields and dr up to >99:1. A range of functional groups are tolerated in the Grignard reagent (e.g., COOR, CN, CF3, SF5). The use of heterocyclic iodohydrins leads to trans-3,4-disubstituted pyrrolidines and tetrahydrofurans.
Ketone Formation via Mild Nickel-Catalyzed Reductive Coupling of Alkyl Halides with Aryl Acid Chlorides
作者:Fan Wu、Wenbin Lu、Qun Qian、Qinghua Ren、Hegui Gong
DOI:10.1021/ol3011198
日期:2012.6.15
The present work highlights unprecedented Ni-catalyzed reductive coupling of unactivated alkyl iodides with aryl acid chlorides to efficiently generate alkyl arylketones under mild conditions.
A nickel-catalyzed direct reductive cross-coupling of disubstituted cycloalkyl iodides with aryl iodides was developed. The one-pot reaction, which is simple to operate, was capable of proceeding efficiently in a stereocontrolled manner to afford a variety of cross-coupled products with high diastereoselectivity and wide functional group tolerance.
Highly Diastereoselective Iron-Mediated C(sp2)C(sp3) Cross-Coupling Reactions between Aryl Grignard Reagents and Cyclic Iodohydrine Derivatives
作者:Andreas K. Steib、Tobias Thaler、Kimihiro Komeyama、Peter Mayer、Paul Knochel
DOI:10.1002/anie.201007187
日期:2011.3.28
trans‐2‐Arylcycloalcohol derivatives are obtained in high diastereoselectivity by the iron‐mediated cross‐coupling of cyclic TBS‐protected iodohydrines with aryl Grignard reagents (see scheme; TBS=tert‐butyldimethylsilyl). The stereoconvergent cross‐coupling of a chiral TBS‐protected 2‐iodocyclohexanol provides the 2‐arylcyclohexanols with no loss of stereochemical purity, and is a valuable alternative