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。
ZHU, ZHAONING;YU, LINGCHONG, BEHJTSZIN SHIFAN DASYUEH SYUEHBAO,(1989) N, S. 63-67
作者:ZHU, ZHAONING、YU, LINGCHONG
DOI:——
日期:——
A new chiral glycine synthon. Synthesis, x-ray structure of (−).(2S,4R)-2-ethoxycarbonyl-4-phenyl-1,3-oxazolidine and diastereoselective nucleophilic ring opening to (R)-ethyl α-amino carboxylates.
Condensation of (R)-N-benzyl-2-phenylglycinol 1 with the methyl hemiacetal of ethyl glyoxylate leads to (2S,4R)-2-ethoxycarbonyl-4-phenyl-1,3-oxazolidine 2 as the major product, obtained as a pure enantiomer after column chromatography. Compound 2 is stereoselectively cleaved by dialkylzinc reagents, prepared from alkylmagnesium iodides and ZnCl2, with moderate to good d.e.ś (72–94 %). These compounds