Application of t-butyldimethylsilyl ethers of serine, threonine and tyrosine in peptide syntheshsis
摘要:
The utility of Tbdms (t-butyldimethylsilyl) ethers, prepared conveniently in a one-pot procedure from N(alpha)-Fmoc (9-fluorenylmethoxycarbonyl) and N(alpha)-Z (benzyloxycarbonyl) hydroxyamino acids, is demonstrated: peptide bond formation and esterification to 4-alkoxybenzylalcohol resin are achieved readily with these derivatives. The lability of the Tbdms ethers to various reagents enables selective deprotection of the hydroxyl side-chains after peptide chain assembly, desirable, e.g., for phosphorylation or glycosilation.
Concise synthesis of glyconoamidines as affinity ligands for the purification of β-glucosidase involved in control of some biological events including plant leaf movement
作者:Eisuke Kato、Tadahiro Kumagai、Minoru Ueda
DOI:10.1016/j.tetlet.2005.05.060
日期:2005.7
biochemical studies and would be useful as an affinityligand for purification of glycosidase. However, its use for the specific inhibition of glucosidase which is highly specific to a glycoside with voluntary aglycon is seriously restricted because no universal method for the synthesis of N-alkylated glyconoamidine has been reported. Here, we report a concise synthesis of N-alkylated Ganem’s glyconoamidine
One aspect of the invention relates to inhibitors that preferentially inhibit immunoproteasome activity over constitutive proteasome activity. In certain embodiments, the invention relates to the treatment of immune related diseases, comprising administering a compound of the invention. In certain embodiments, the invention relates to the treatment of cancer, comprising administering a compound of the invention.
The first total synthesis of antibacterial epicoccarine A isolated from a fungus Epicoccum sp. has been accomplished in 10 steps along with synthetic elaboration of its C5-epimer, highlighting the utility of O- to C-acyl rearrangement of a 4-O-acyltetramic acid derivative. Comparison of spectroscopic properties and specific optical rotations of the synthetic samples with those reported for authentic material has clearly indicated the unspecified absolute stereochemistry of this natural product to be 5S.