Novel 6-amino acid heteroaryldihydropyrimidines for the treatment and prophylaxis of hepatitis B virus infection

A compound of formula (I)

• wherein
• R1 is C1-6alkyl or trifluoromethyl-CxH2—, wherein x is 1-6;
• One of R2 and R3 is phenyl, which is once or twice or three times substituted by C1-6alkyl, cyano or halogen;
• and the other one is hydrogen or deuterium;
• R4 is phenyl, thiazolyl, oxazolyl, imidazolyl, thienyl or pyridinyl, which is unsubstituted or substituted by C1-6alkyl, C1-6alkylsulfanyl, halogen or cycloalkyl, where said C1-6alkyl can be further optionally substituted with halogen;
• A is
• which is unsubstituted or substituted by groups selected from C1-6alkyl, deuterium and halogen;
• or pharmaceutically acceptable salts, or enantiomers, or diastereomers thereof.