Cobalt-mediated alkylation of (4R) and (4S)-3-acetoacetyl-4-benzyloxazolidin-2-ones. Preparation of enantiopure diphenylmethyl-, 9-fluorenyl- and (1-adamantyl)glycines
作者:Nicanor Gálvez、Marcial Moreno-Mañas、Adelina Vallribera、Elies Molins、Araceli Cabrero
DOI:10.1016/0040-4039(96)01322-6
日期:1996.8
The Co(II) complexes of (4R) and (4S)-3-acetoacetyl-4-benzyloxazolidin-2-ones are alkylated diastereoselectively with diphenylmethyl, 9-fluorenyl, and 1-adamantyl bromide. The resulting products are converted into enantiopure α-substituted glycines. Similar results are obtained by alkylation of the free acetoacetyloxazolidinones under Co(II)-catalysis.
(4 R)和(4 S)-3-乙酰乙酰基-4-苄基恶唑烷丁-2-酮的Co(II)配合物被二苯甲基,9-芴基和1-金刚烷基溴化物非对映选择性地烷基化。将所得产物转化为对映体纯的α-取代的甘氨酸。在Co(II)催化下,通过将游离的乙酰乙酰基恶唑烷酮进行烷基化,可获得相似的结果。