新产品编号:247301

合成路线:Amino acid (II) (obtained by N-alkylation of N-Boc-D-phenylalanine (I) with MeI),was coupled to (S)-1-amino-2-propanol (III) using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide-HCl (EDC) and 1-hydroxybenzotriazole to give amide (IV).The N-Boc group of (IV) was then deprotected with trifluoroacetic acid in CH2Cl2 to afford (V).Further coupling of (V) with D-naphthylalanine derivative (VI),followed by Boc deprotection with trifluoroacetic acid,provided dipeptide amide (VII).This dipeptide was coupled to intermediate amino acid (VIII) using EDC and 1-hydroxy-7-azabenzotriazole yielding tripeptide (IX).Finally,trifluoroacetic acid-promoted Boc-deprotection of (IX) provided the target compound.Intermediate amino acid (VIII) was prepared from 3-(tert-butoxycarbonylamino)-3-methylbutanoic acid (X) upon conversion to the mixed anhydride with ethyl chloroformate,followed by reduction to alcohol (XI) with LiBH4.Subsequent Swern oxidation of the alcohol (XI) furnished aldehyde (XII).This was condensed with triethyl phosphonoacetate,and then saponified with LiOH to produce the intermediate (VIII).

参考文献标题:Growth hormone component and bone anti-resorptive agent in cyclic (coherence) treatment of osteoporosis
文献作者:Eriksen,E.F.; Kappelgaard,A.-M.(Novo Nordisk A/S)
参考来源:WO 9746252


合成路线:The intermediate N-Boc-amino acid (VII) was synthesized as shown in Scheme 25409101a.Treatment of 3-(tert-butoxycarbonylamino)-3-methylbutanoic acid (I) with ethyl chloroformate and Et3N,followed by reduction of the resulting mixed anhydride (II) with LiBH4,provided alcohol (III).Then,oxidation of (III) under Swern conditions yielded aldehyde (IV).Subsequent Horner-Emmons condensation of (IV) with triethyl phosphonoacetate (V) in the presence of potassium tert-butoxide gave ester (VI),which was saponified with LiOH to provide the required carboxylic acid (VII).

合成路线:Methylation of N-Boc-D-phenylalanine (VIII) with methyl iodide and NaH afforded the N-methyl amino acid (IX).After coupling with methylamine in the presence of EDC and HOBt,the Boc protecting group of the resulting amide (X) was removed by treatment with trifluoroacetic acid to give (XI).The N-methyl amino acid (XIII),prepared by methylation of N-Boc-naphthylalanine (XII),was then coupled to amine (XI) by means of EDC and HOAt to yield dipeptide amide (XIV).A further treatment of (XIV) with trifluoroacetic acid removed the Boc protecting group to yield (XV),which was then coupled with amino acid (VII) in the presence of EDC and HOAt yielding (XVI).Finally,deprotection of the Boc-tripeptide (XVI) with trifluoroacetic acid provided the title compound.

合成路线:Amino acid (II) (obtained by N-alkylation of N-Boc-D-phenylalanine (I) with MeI),was coupled to (S)-1-amino-2-propanol (III) using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide-HCl (EDC) and 1-hydroxybenzotriazole to give amide (IV).The N-Boc group of (IV) was then deprotected with trifluoroacetic acid in CH2Cl2 to afford (V).Further coupling of (V) with D-naphthylalanine derivative (VI),followed by Boc deprotection with trifluoroacetic acid,provided dipeptide amide (VII).This dipeptide was coupled to intermediate amino acid (VIII) using EDC and 1-hydroxy-7-azabenzotriazole yielding tripeptide (IX).Finally,trifluoroacetic acid-promoted Boc-deprotection of (IX) provided the target compound.Intermediate amino acid (VIII) was prepared from 3-(tert-butoxycarbonylamino)-3-methylbutanoic acid (X) upon conversion to the mixed anhydride with ethyl chloroformate,followed by reduction to alcohol (XI) with LiBH4.Subsequent Swern oxidation of the alcohol (XI) furnished aldehyde (XII).This was condensed with triethyl phosphonoacetate,and then saponified with LiOH to produce the intermediate (VIII).
参考文献标题:Novel orally active growth hormone secretagogues
文献作者:Hansen,T.K.; Ankersen,M.; Hansen,B.S.; Raun,K.; Nielsen,K.K.; Lau,J.; Peschke,B.; Lundt,B.F.; Thogersen,H.; Johansen,N.L.; Madsen,K.; Andersen,P.H.
参考来源:J Med Chem 1998,41(19),3705