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
Sequential C–N and C–O Bond Formation in a Single Pot: Synthesis of 2<i>H</i>-Benzo[<i>b</i>][1,4]oxazines from 2,5-Dihydroxybenzaldehyde and Amino acid Precursors
作者:Javed Iqbal、Neelima D. Tangellamudi、Balakrishna Dulla、Sridhar Balasubramanian
DOI:10.1021/ol2031747
日期:2012.1.20
Functionalized beta-aryl alanine ester derivatives were found to undergo rapid C-N and C-O bond formation with quinol carbonyl compounds to afford 2H-benzo[b][1,4]oxazines in good to excellent yields. This unprecedented finding reported herein offers a straightforward, highly efficient, and rapid method for the synthesis of 2H-benzo[b][1,4]oxazines.
RAO, M. NARAYANA;HOLKAR, A. G.;AYYANGAR, N. R., TETRAHEDRON LETT., 30,(1989) N5, C. 4717-4720