Diastereoselective synthesis of highly functionalized β2,2,3-substituted amino acids from 4-substituted-1,3-oxazinan-6-ones
作者:Nghi H. Nguyen、Brad E. Sleebs、Jonathan M. White、Andrew B. Hughes
DOI:10.1016/j.tet.2012.04.012
日期:2012.6
5-dialkylated oxazinanones were then transformed to N-methyl β2,2,3-substituted amino acids by reductive cleavage. Hydrolysis or solvolysis of the oxazinanones afforded β2,2,3-substituted amino acids or esters, respectively. The chemistry thus provides access to a range of symmetrical and stereopure β2,2,3-substituted amino acids and further establishes 1,3-oxazinan-6-ones as useful intermediates.
-1,3-恶嗪烷-6-酮被用于产生取代的β 2,2,3取代的氨基酸衍生物。1,3-恶嗪南-6-酮的烯醇被亲电试剂反式选择性地拦截。随后对该烷基化进行最优化以进行一锅二烷基化以形成5,5-二取代的恶嗪酮。最初的5-单甲基化化合物可以被烯醇化,然后用不同的亲电试剂非对映选择性地截获,以形成不同的5,5-二取代产物。然后通过还原裂解将5,5-二烷基化的恶嗪酮酮转化为N-甲基β2,2,3-取代的氨基酸。恶唑烷酮的水解或溶剂分解得到β2,2,3-取代的氨基酸或酯。化学因此提供访问一系列的对称和stereopureβ 2,2,3-取代的氨基酸和进一步确立1,3-恶嗪烷-6-酮作为有用的中间体。