A Formal [3,3]-Sigmatropic Rearrangement Route to Quaternary α-Vinyl Amino Acids: Use of Allylic <i>N</i>-PMP Trifluoroacetimidates
作者:David B. Berkowitz、Bin Wu、Huijie Li
DOI:10.1021/ol060019s
日期:2006.3.2
Pd(II)-mediated rearrangement of allylic N-PMP (p-methoxyphenyl) trifluoroacetimidates provides the first formal sigmatropic route to quaternary, alpha-vinylic amino acids, potential suicide substrates for PLP enzymes. The amino acid side chains enter via transition-metal-mediated C-C bond constructions, including (i) Cu(I)-mediated conjugate addition (Ala); (ii) Pd(0)/AsPh3-mediated Stille coupling
Studies on Optically Active Amino Acids. XV. Studies on α-Alkyl-α-amino Acids. VIII. Absolute Configuration of Optically Active α-Methylserine and 2-Amino-2-methyl-3-butenoic Acid.
The absolute configuration of (+)-α-methylserine ((+)-IX) obtained from natural source, has been elucidated to be S-configuration by the chemical correlation with (+)-isovaline ((+)-VII), at the same time the absolute configuration of (+)-2-amino-2-methyl-3-butenoic acid ((+)-XI) has also been proved to be S-series. Chemical schemes employed were shown in Charts 1 and 2. Optically active hydantoins (V and VIII) used in the correlation were prepared by the direct resolution of racemic hydantoins with brucine. Preliminary examinations using racemic compounds were also reported.
通过与(+)-异戊氨酸((+)-VII)的化学关联,从天然来源获得的(+)-α-甲基丝氨酸((+)-IX)的绝对构型被阐明为 S 构型,同时(+)-2-氨基-2-甲基-3-丁烯酸((+)-XI)的绝对构型也被证明为 S 系列。采用的化学方案如图 1 和图 2 所示。相关研究中使用的光学活性海因(V 和 VIII)是通过外消旋海因与丁二酸的直接分解制备的。还报告了使用外消旋化合物进行的初步研究。
Aziridination of 5-Methyl-4H-1,3-dioxins by N-Tosyliminophenyliodinane: A One-step Procedure for the Synthesis of α-Methylserinal Derivatives
作者:Susanne Flock、Herbert Frauenrath
DOI:10.1055/s-2001-14607
日期:——
The methyl analogue of Garner's aldehyde, N-tosyl-4-methyl-N,O-isobutyrylideneserinal, has been prepared in a one-step reaction by CuClO4-catalyzed aziridination of 2-isopropyl-5-methyl-4H-1,3-dioxin with N-tosyliminophenyliodinane and transformed into α-methylserine derivatives, e.g. α-vinylalanine.
Pedersen, Michelle L.; Berkowitz, David B., Journal of Organic Chemistry, 1993, vol. 58, # 25, p. 6965 - 6975
作者:Pedersen, Michelle L.、Berkowitz, David B.
DOI:——
日期:——
Polyenolates of Unsaturated Carboxylic Acids in Synthesis. Synthesis of Unsaturated α-Amino Acids and β-Hydrazing Acids
作者:M. J. Aurell、S. Gil、P. V. Martinez、M. Parra、A. Tortajada、R. Mestres
DOI:10.1080/00397919108021773
日期:1991.9
Regioselective reaction of lithium dieneand triene-diolates 1 and 2 with o-diphenylphosphinyl hydroxylamine affords unsaturated alpha-amino acids 3 and 4. Addition to DEAD leads selectively to gamma-hydrazino unsaturated acids 5 and 6.