Diastereoselective Synthesis of Aliphatic α,α-Difluoro-β<sup>3</sup>-Amino Esters via a Sonocatalyzed Reformatsky Reaction
作者:Taryn L. March、Martin R. Johnston、Peter J. Duggan
DOI:10.1021/ol202969w
日期:2012.1.6
(R)-2-Phenylglycine ethyl ester was found to be a cheap and effective auxiliary for the preparation of aliphatic α,α-difluoro-β3-amino esters via a Reformatsky reaction performed under sonication conditions. The products were obtained in good to high yield and ≥96:4 dr, thus providing a new stereoselective route to this under-represented class of compounds. A facile one-pot removal of the phenylglycine
(- [R)-2-苯基甘氨酸乙酯被发现是一种廉价和有效的辅助为脂族α的制备中,α二氟β 3经由reformatsky反应-氨基酯超声处理条件下进行。获得的产品具有良好的高收率和≥96:4 dr,因此为此类代表性不足的化合物提供了新的立体选择性途径。一种简便一锅除去苯基甘氨酸部分和伴随的Boc保护的随后得到相应的Boc保护的β 3 -氨基酯的优良率。