摘要:
Process and novel intermediates for preparing the L-monovaline ester of 2- (2-amino-1,6-dihydro-6-oxo-purin-9-yl) -methoxy-1,3-propanediol (ganciclovir) and its pharmaceutically acceptable salts. The present process and monoester intermediates provide for monoesterification by an L-valine derivative, resulting in a monocarboxylate-monovalinate which is then selectively hydrolyzed under basic or enzymatic conditions to give the monovaline ester of ganciclovir in high yield and purity. These products are of value as antiviral agents with improved absorption.
摘要:
The present invention relates to a novel process for producing a δ-lactone of the formula (I) using an acyl halide of the formula (1) wherein R?1, R2, R3¿ and X are described herein, as well as novel intermediates. In particular, the present invention relates to a process for enantioselectively producing the (R)-δ-lactone.
摘要:
The present invention relates to a novel process for producing a δ-lactone of the formula (I) using an acyl halide of the formula (1) wherein R?1, R2, R3¿ and X are described herein, as well as novel intermediates. In particular, the present invention relates to a process for enantioselectively producing the (R)-δ-lactone.
摘要:
The present invention relates to the preparation of insulinotropic peptides that are synthesized using a solid and solution phase ('hybrid') approach. Generally, the approach includes synthesizing three different peptide intermediate fragments using solid phase chemistry. Solution phase chemistry is then used to add additional amino acid material to the third fragment which is then coupled to the second fragment and then the first fragment in solution. Alternatively, a different second fragment is coupled to the first fragment in the solid phase. Then, solution phase chemistry is then used to add additional amino acid material to a different third fragment. Subsequently, this different third fragment is coupled to the coupled first and different second fragment in the solution phase. The use of a pseudoproline in one of the fragments eases solid phase synthesis of that fragment and also eases subsequent solution phase coupling of this fragment to the other fragments. The present invention is very useful for forming insulinotropic peptides such as GLP- 1(7-36) and its natural and non-natural counterparts.
摘要:
Process and novel intermediates for preparing the L-monovaline ester of 2- (2-amino-1,6-dihydro-6-oxo-purin-9-yl) -methoxy-1,3-propanediol (ganciclovir) and its pharmaceutically acceptable salts. The present process and monoester intermediates provide for monoesterification by an L-valine derivative, resulting in a monocarboxylate-monovalinate which is then selectively hydrolyzed under basic or enzymatic conditions to give the monovaline ester of ganciclovir in high yield and purity. These products are of value as antiviral agents with improved absorption.