A nickel pincer complex is found to catalyze alkyl-alkyl Kumada coupling reactions of 1,3- and 1,4-substituted cyclohexyl halides and tetrahydropyrans with an excellent diastereoselectivity. The mechanistic investigation of the coupling reactions provides evidence that the activation of alkyl halides is reversible.
Synthesis of <i>E</i>-Alkyl Alkenes from Terminal Alkynes via Ni-Catalyzed Cross-Coupling of Alkyl Halides with B-Alkenyl-9-borabicyclo[3.3.1]nonanes
作者:Thomas Di Franco、Alexandre Epenoy、Xile Hu
DOI:10.1021/acs.orglett.5b02482
日期:2015.10.2
The first Ni-catalyzed Suzuki–Miyaura coupling of alkyl halides with alkenyl-(9-BBN) reagents is reported. Both primary and secondary alkyl halides including alkylchlorides can be coupled. The coupling method can be combined with hydroboration of terminal alkynes, allowing the expedited synthesis of functionalized alkyl alkenes from readily available alkynes with complete (E)-selectivity in one pot
Prins cyclization between a homoallylic alcohol and an aldehyde, promoted by trimethylsilyl halide, afforded 4-halo-tetrahydropyrans with good to excellent yields. Thanks to the absence of the solvent and metal, the THP thus obtained have been implicated without purification in several other reactions, in a sequential way, affording in particular new indole derivatives.
The present invention provides compounds of general formula I: or a pharmaceutically acceptable salt thereof, wherein X, n, Y, and R1 are defined generally and in subsets herein. Compounds of the invention are inhibitors of CCR2 and accordingly are useful for the treatment of a variety of inflammatory, allergic, and autoimmune diseases, disorders, or conditions.
The present invention provides compounds of general formula I:
or a pharmaceutically acceptable salt thereof, wherein X, n, Y, and R
1
are defined generally and in subsets herein. Compounds of the invention are inhibitors of CCR2 and accordingly are useful for the treatment of a variety of inflammatory, allergic, and autoimmune diseases, disorders, or conditions.
The present invention provides compounds of general formula I: or a pharmaceutically acceptable salt thereof, wherein X, n, Y, and R1 are defined generally and in subsets herein. Compounds of the invention are inhibitors of CCR2 and accordingly are useful for the treatment of a variety of inflammatory, allergic, and autoimmune diseases, disorders, or conditions.