Carboxylic acid salts of beta-alanine esters or -amides

摘要

The present invention relates to a compound of formula (6)
wherein R is alkyl, aryl, arylalkyl, or heteroaryl, and wherein R 1 is -XR wherein
X is O,
S, or
Se, or R 1 is
wherein R 2 or R 3 is independently
alkyl
cycloalkyl,
arylalkyl, or
aryl, or
R 2 and R 3 together are
-(CH 2 ) 4 -,
-(CH 2 ) 5 -,
-(CH(R 4 )-CH 2 ) 3 -,
-(CH(R 4 )-CH 2 ) 4 -,
-(CH(R 4 )-CH 2 ) 2 -(CH(R 4 ))-,
-(CH(R 4 )-CH 2 ) 3 -(CH(R 4 ))-,
-CH 2 -CH 2 -A-CH 2 -CH 2 -,
-CH(R 4 )-CH 2 -A-CH 2 CH 2 -,
-CH(R 4 )-CH 2 -A-CH 2 CH(R4)-
wherein R 4 is alkyl of from one to four carbon atoms, A is O, S, or N, and R is as defined above.