Palladium-catalyzed cross-coupling of benzylzinc reagents with 2-bromo-3,3,3-trifluoropropene
摘要:
alpha-Trifluoromethyl alkenes can be used as peptide isosteres, moreover, the pre-installed vinyl group make it possible that transformation to diverse fluorine-containing unities. However, the cross-coupling of benzyl group with alpha-trifluoromethyl alkenes has yet to be developed. In this report, we describe a general method for the cross-coupling of benzylzinc reagents with 2-bromo-3,3,3-trifluoropropene (BTP) to afford diverse alpha-trifluoromethylalkene derivatives by using Pd(TFA)(2) as catalyst. This method takes advantage of cheap industrial available fluorine building blocks and easily prepared benzylzinc reagents to generate alpha-trifluoromethylalkene derivatives, which features with mild reaction conditions, wide substrate scope and feasibility of product transformations.
Ni-Catalyzed Regioselective 1,2-Dialkylation of Alkenes Enabled by the Formation of Two C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Bonds
作者:Roshan K. Dhungana、Rishi R. Sapkota、Laura M. Wickham、Doleshwar Niroula、Ramesh Giri
DOI:10.1021/jacs.0c09778
日期:2020.12.16
We disclose a Ni-catalyzed vicinal difunctionalization of alkenes with benzyl halides and alkylzinc reagents, which produces products with two new alkyl-alkyl bonds. This alkene dialkylation is effective in combining secondary benzyl halides and secondary alkylzinc reagents with internal alkenes, which furnishes products with three contiguous all-carbon secondary stereocenters. The products can be
Correction to “Ni-Catalyzed Regioselective 1,2-Dialkylation of Alkenes Enabled by the Formation of Two C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Bonds”
作者:Roshan K. Dhungana、Rishi R. Sapkota、Laura M. Wickham、Doleshwar Niroula、Ramesh Giri
DOI:10.1021/jacs.1c06574
日期:2021.7.21
The position of the alkene in compound 73 was misplaced. The correct position is 4,5 instead of 3,4. The compound 73 with the correct alkene position and updated spectral data are provided in the corrected Supporting Information. The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/jacs.1c06574. Experimental procedures and characterization data for all compounds
The present invention relates to compounds of general formula (I), wherein the groups R1, R2 and m are defined as in claim 1, which have valuable pharmacological properties, in particular bind to the GPR40 receptor and modulate its activity. The compounds are suitable for treatment and prevention of diseases which can be influenced by this receptor, such as metabolic diseases, in particular diabetes type 2.