Figure 3: Asymmetric Suzuki-Miyaura coupling with pyridine-derived boronic acids. | Nature Communications

Figure 3: Asymmetric Suzuki-Miyaura coupling with pyridine-derived boronic acids.

From: Asymmetric Suzuki-Miyaura coupling of heterocycles via Rhodium-catalysed allylic arylation of racemates

Figure 3

(a) Examination of pyridine boronic acid derivatives and core-modified pyridyl boronic acids. (b) Cross-coupling of various chloropyridineboronic acids. (c) Pyridine inhibits an asymmetric coupling reaction while 2-Cl-pyridine does not, suggesting that the role of the 2-Cl-unit is to make the pyridine-based partner less Lewis basic and bind less effectively to Rh-species. (d) Addition of water to the 2-Cl-pyridinyl boronic acid simplifies its NMR spectra in DMSO suggesting it breaks aggregates into monomers. (e) Tentative reaction mechanism for the Rh-catalyzed cross-coupling. All yields are isolated yields.

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