Studies related to the absolute configuration of cyclocinamide A: Total synthesis of 4(R),11(R)-cyclocinamide A
作者:Paul A. Grieco、Michael Reilly
DOI:10.1016/s0040-4039(98)02016-4
日期:1998.12
oic acid afforded tetrapeptide 11 which was transformed into cyclic peptide 12. Cleavage of the BOC in 12 followed by coupling with the glycine derived side chain 14 gave rise, after removal of the benzoyl group to 4(R),11(R)-cyclocinamide A (2) which was not identical to natural cyclocinamide A (1), suggesting that 1 possesses the 4(S),7(S),11(S),14(S) configuration.
的芴基甲基酯的偶合3(的(R = FM)小号)-5- bromotryptophan用N α -BOC-(小号)-Asn-O苯甲酰基(- [R)-ise 9产生了三肽10。在BOC基团的裂解10,接着用N个耦合α -BOC-N β -Fmoc-([R)-2-3二氨基丙酸,得到四肽11将其转化成环肽12。在BOC的裂解12接着与甘氨酸偶联衍生的侧链14产生了,除去苯甲酰基团后,以4(R),11(R)-环酰胺A(2)与天然环酰胺A(1)不同,表明1具有4(S),7(S),11(S),14(S)构型。