A solution of2a(0.493 g, 1.0 mmol) in chloroform (15 mL) was condensed with 2-cyanoacetic acid (0.850 g, 10.0 mmol) in the presence of piperidine (0.20 mL, 2.0 mmol).
A solution of2a(0.493 g, 1.0 mmol)in chloroform (15 mL) was condensed with 2-cyanoacetic acid(0.850 g, 10.0 mmol) in the presence of piperidine (0.20 mL,2.0 mmol).