The invention provides novel inhibitors of IAP that are useful as therapeutic agents for treating malignancies where the compounds have the general formula (I), and G, X
1
, X
2
, R
1
, R
2
, R
3
, R
4
, R
4
′, R
5
, R
a
, R
b
, and R
c
are as described herein.
The invention provides novel inhibitors of IAP that are useful as therapeutic agents for treating malignancies where the compounds have the general formula I:
wherein X, Y, A, R
1
, R
2
, R
3
, R
4
, R
4
′, R
5
, R
5
′, R
6
and R
6
′ are as described herein.
Isothiazolium salts 2 and 3 are easily available by reaction of (Z/E)-beta-thiocyanatovinyl aldehydes with primary aliphatic and aromatic amines in acetic acid or with aromatic amine hydrochlorides, respectively. Preparative advantages of this reaction are demonstrated and discussed. Reaction of 3 with secondary amines results in an unexpected formation of 6a-lambda-4-thia-1,6-diazapentalenes 5, a new typ of thiadiazapentalenes anellated with a heterocyclic ring system. The structure of 5 was evidenced by IR, UV, H-1-, C-13-n.m.r. spectral data and supported by elemental analysis. By means of N-15- and C-13-n.m.r. spectroscopy the synthesized thiadiazapentalenes were found to be stable towards protonation.