1,4-Dioxane → Methyl 5-cyano-2,3'-bipyridine-6'-carboxylate

To a microwave vial was added methyl 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2-pyridinecarboxylate (2 g, 7.60 mmol), 6-bromo-3-pyridinecarbonitrile (2.09 g, 11.40 mmol), PdCl2(dppf)-CH2Cl2 adduct (0.62 g, 0.760 mmol), NaHCO3 (1.277 g, 15.20 mmol), 1,4-dioxane (8 ml) and water (2 ml). The mixture was microwaved for 15 min at 105° C. The resulting dark solution was diluted with water and CH2Cl2. The aqueous layer was extracted three times with CH2Cl2. The CH2Cl2 extracts were passed over a phase separator, concentrated and purified on a Biotage SP4 with a 65i column at a flow rate of 65 ml/min, 0.1% TFA eluting with 2CV water, the 0-100% ACN/Water over 10 CV. The fractions containing the product were combined and diluted with CH2Cl2 and sat. NaHCO3. The layers were separated and the aqueous layer was extracted twice with CH2Cl2, then the combined organic extracts were dried and concentrated to afford the desired product (1.0 g, 1.75 mmol) as an off white solid. LCMS (m/z): 262.0 (M+Na).

1. customThe mixture was microwaved for 15 min at 105° C
2. extractionThe aqueous layer was extracted three times with CH2Cl2
3. concentrationconcentrated
4. custompurified on a Biotage SP4 with a 65i column at a flow rate of 65 ml/min, 0.1% TFA eluting with 2CV water
5. additionThe fractions containing the product
6. additiondiluted with CH2Cl2 and sat. NaHCO3
7. customThe layers were separated
8. extractionthe aqueous layer was extracted twice with CH2Cl2
9. customthe combined organic extracts were dried
10. concentrationconcentrated

ORD record

ord-956ce52e5e644b5b86ce0aa44a1fe406

Source dataset

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08450484B2