摘要:
The present invention concerns new (R)-, (S)- and (R,S)-1-(4'-alkylamido)-2'-{1-[N-(alkyl)imino]ethyl}phenoxy-3-alklyamino-2-propanols having the general formula ##STR1## wherein R means a straight or branched C.sub.1 -C.sub.4 -alkyl group, especially the n-propyl group, and R.sub.1 means hydrogen or a straight or branched C.sub.1 -C.sub.4 -alkyl group, especially the isopropyl group, which compounds are useful intermediates when preparing the pharmacologically active (R)-, (S)- and (R,S)-1-(4'-alkylamido-2'-acetyl)phenoxy-3-alkylamino-2-propanols of the formula ##STR2## wherein R and R.sub.1 have the meaning given above.
摘要:
This invention relates to an improved method of preparing furocoumarins having the following formula: ##STR1## wherein R is a radical selected from the group consisting of hydrogen, hydroxy and lower alkoxy, which comprises reacting a coumarin having the following formula: ##STR2## or the alkali metal salt thereof, with a haloacetal having the following formula: ##STR3## WHEREIN R.sub.1 is a lower alkyl group and Hal is selected from the group consisting of chlorine and bromine; and to the intermediate products thereof, namely a substituted coumarin acetal of the following formula: ##STR4## and the corresponding coumarin aldehyde of the following formula: ##STR5##