Amide Enolate Additions to Acylsilanes: In Situ Generation of Unusual and Stereoselective Homoenolate Equivalents
作者:Robert B. Lettan、Chris V. Galliford、Chase C. Woodward、Karl A. Scheidt
DOI:10.1021/ja808811u
日期:2009.7.1
The synthesis of beta-hydroxy carbonyl compounds is an important goal due to their prevalence in bioactive molecules. A novel approach to construct these structural motifs involves the multicomponent reaction of acylsilanes, amides, and electrophiles. The addition of amide enolates to acylsilanes generates beta-silyloxy homoenolate reactivity by undergoing a 1,2-Brook rearrangement. These unique nucleophiles
β-羟基羰基化合物的合成是一个重要的目标,因为它们普遍存在于生物活性分子中。一种构建这些结构基序的新方法涉及酰基硅烷、酰胺和亲电试剂的多组分反应。通过进行 1,2-布鲁克重排,将酰胺烯醇化物添加到酰基硅烷中会产生 β-甲硅烷氧基均烯醇化物反应性。这些在原位形成的独特亲核试剂随后可以与卤代烷、醛、酮和亚胺进行加成。通过将这些同烯醇化物添加到 N-二苯基膦亚胺中而产生的 γ-氨基-β-羟基酰胺产物具有出色的非对映选择性(> 或 = 20:1),并且可以有效地转化为高价值的 γ-内酰胺。最后,