The present invention provides a process for preparing an amide, which comprises reacting an amine with an ester in a molten form in the absence of a solvent.
本发明提供了一种制备酰胺的方法,包括在无溶剂的情况下,将胺与酯在熔融状态下反应。
Substituted acylpiperazinoquinazolines and pharmaceutical compositions
申请人:SPOFA, spojene podniky pro zdravotnickou vyrobu
公开号:US04775673A1
公开(公告)日:1988-10-04
Substituted acylpiperazinoquinazolines of formula I ##STR1## wherein n is 0 or 1, R represents an alkyl group with 1 to 4 carbon atoms or a benzyl group, and R.sub.1 is a hydrogen atom, a methyl group or a phenyl group. Addition salts of these compounds with inorganic and organic acids are also disclosed. The compounds possess a significant antihypertensive activity. They can be prepared by the reaction of 2-halogeno quinazoline derivatives with the corresponding acylpiperazines, followed (if required) by neutralization of the respective base with a suitable acid to form its pharmaceutically convenient addition salt. The acid addition salts, especially hydrochlorides, are readily soluble in water and give stable, almost neutral aqueous solutions which can be used in parenteral (injectable) and peroral medicinal dosage forms.