Preparation ofβ2-Amino Acid Derivatives (β2hThr,β2hTrp,β2hMet,β2hPro,β2hLys, Pyrrolidine-3-carboxylic Acid) by Using DIOZ as Chiral Auxiliary
作者:Francois Gessier、Laurent Schaeffer、Thierry Kimmerlin、Oliver Flögel、Dieter Seebach
DOI:10.1002/hlca.200590157
日期:2005.8
3-oxazolidin-2-one’ (DIOZ) was demonstrated, once more, in these reactions and in subsequent transformations leading to various t-Bu-, Boc-, Fmoc-, and Cbz-protected β2-homoamino acid derivatives 11–23 (Schemes 3–6). The use of ω-bromo-acyl-oxazolidinones 1–3 as starting materials turned out to open access to a variety of enantiomerically pure trifunctional and cyclic carboxylic-acid derivatives.
从缬氨酸衍生制备标题化合物Ñ -acylated恶唑烷-2-酮,1 - 3,7,9,由高度非对映(≥90%)曼尼希反应( 4 - 6 ;方案1)或醛醇加成( 8和10;方案2)的相应的Ti-或B-烯酸酯作为关键步骤。在这些反应以及随后导致各种t- Bu-,Boc的转化中,再次证明了“ 5,5-二苯基-4-异丙基-1,3-恶唑烷-2-酮”(DIOZ)的优越性。 - ,的Fmoc-和Cbz-保护的β 2个-homoamino酸衍生物11 – 23(方案3–6)。使用ω溴酰基-恶唑烷酮1 - 3作为起始原料变成了开放访问各种对映体纯三官能和环状羧酸的衍生物。