Novel N-2-methylmaleirnide pegylating reagents for the site specific pegylation of therapeutically active proteins and methods for such pegylation using said reagents.
Design and synthesis of a s-triazene based asymmetric organocatalyst and its application in enantioselective alkylation
作者:Shrawan K. Mangawa、Ashawani K. Singh、Satish K. Awasthi
DOI:10.1039/c5ra11209e
日期:——
A very efficient chiral organocatalyst was prepared from the readily available cyanuric chloride.
一个非常高效的手性有机催化剂是从易得的三聚氯氰酸氯制备的。
Efficient Synthesis of <font>α</font>-Substituted Amino Acid Ester: Alkylation and Hydrogenation Removal of Schiff's Base Protecting Group
作者:Aslam M. Ansari、Sydney O. Ugwu
DOI:10.1080/00397910802138611
日期:2008.6.27
Abstract A general and efficient syntheticroute to α-aminoacids by alkylation of the sodium salt of Schiff base ester 1 has been described previously. The α-substituted ethyl glycinates 4a–g are prepared in excellent yield by a two-step sequence involving regioselective alkylation of the anionic glycine synthon 2 with various alkyl halides, followed by purification of the alkylated Schiff base on