| 摘要 |
A compound of the formula <IMAGE> (I) , or a salt thereof, OR OF THE FORMULA <IMAGE> (Ia) , OR A SALT THEREOF, WHEREIN R1 and R2 are the same or different and each is hydrogen, lower alkyl, cycloalkyl of 4 to 7 carbon atoms, aryl of 6 to 14 carbon atoms, or aralkyl of up to 18 carbon atoms wherein the alkyl moiety contains up to 6 carbon atoms; and N IS 3, 4 OR 5; IS PRODUCED BY HYDROLYZING A COMPOUND OF THE FORMULA <IMAGE> (II) , wherein R1, R2 and n are as above defined, and X is halogen; A COMPOUND OF THE FORMULA <IMAGE> (III) , or a hydrohalide thereof, wherein R1, R2, n and X are as above defined; or A COMPOUND OF THE FORMULA <IMAGE> (IV) , wherein R1, R2, n and X are as above defined; IN THE PRESENCE OF A BASE AT A TEMPERATURE OF FROM ABOUT 20 DEG TO ABOUT 180 DEG C. |
