Synthesis of imidazo [1, 2-a] pyrazine derivatives with uterine-relaxing, antibronchospastic, and cardiac-stimulating properties

~%

~%

~%

~80%

~%

~%

~%

~89%

~%

~%

~66%

~%

~%

~%

~%

~83%

~45%

~45%

~%

~%

~53%

~%

~%

~30%