Design, Synthesis, and Binding Affinities of Pyrrolinone-Based Somatostatin Mimetics
作者:Amos B. Smith、Adam K. Charnley、Eugen F. Mesaros、Osamu Kikuchi、Wenyong Wang、Andrew Benowitz、Chi-Lien Chu、Jin-Jye Feng、Kuo-Hsin Chen、Atsui Lin、Fong-Chi Cheng、Laurie Taylor、Ralph Hirschmann
DOI:10.1021/ol0476974
日期:2005.2.1
Tetrapyrrolinone somatostatin (SRIF) mimetics (cf. 1), based on a heterochiral (D,L-Mixed) pyrrolinone scaffold, were designed, synthesized, and evaluated for biological activity. The iterative synthetic sequence, incorporating the requisite functionalized coded and noncoded amino acid side chains, comprised a longest linear synthetic sequence of 23 steps. Binding affinities at two somatostatin receptor subtypes (hsst 4 and 5) reveal micromolar activity, demonstrating that the D,L-Mixed pyrrolinone scaffold can be employed to generate functional mimetics of peptide beta-turns.
A second-generation synthesis of scalemic 3,5,5-trisubstituted pyrrolin-4-ones: Incorporation of functionalized amino acid side-chains
作者:Amos B. Smith、Andrew B. Benowitz、David A. Favor、Paul A. Sprengeler、Ralph Hirschmann
DOI:10.1016/s0040-4039(97)00752-1
日期:1997.6
To access mimics of peptidal β-strands (1), scalemic 3,5,5-trisubstituted pyrrolin-4-ones bearing the tyrosine, serine, and lysine side-chains have been generated via cyclization of metalated imino esters and deprotection. The functionalized imino esters were prepared by asymmetric alkylation of a common oxazolidinone precursor (2) derived from L-prenylglycine.