Multicomponent Mannich Reactions with Boron Enolates Derived from Diazo Esters and 9-BBN
作者:Yi Luan、Scott E. Schaus
DOI:10.1021/ol200766t
日期:2011.5.6
3-component Mannich condensation reaction. Catalyzed by Cu(II) salts, the reaction affords the corresponding isocyanate Mannich product: one that can be easily trapped in situ by other nucleophiles. The Mannich condensation corresponds to an α,α-disubstituted enolate addition to imines. The reaction was rendered asymmetric by using the (−)-phenylmenthol ester in good yield and selectivities.
重氮酯、芳基硼烷和氨基甲酰亚胺会发生三组分曼尼希缩合反应。在 Cu(II) 盐的催化下,该反应产生相应的异氰酸酯曼尼希产物:一种很容易被其他亲核试剂原位捕获的产物。曼尼希缩合对应于亚胺上的α,α-二取代烯醇化物加成。通过使用 (-)-苯基薄荷醇酯使反应不对称,具有良好的产率和选择性。