使用简单的β-酮酯作为底物开发了一种合成氰基甲酸酯的新方案。(二乙氨基)三氟化硫 (DAST) 用作双重作用试剂以激活肟部分并提供氟化物。关键中间体,α -oximino- β酮酯中,通过高效的酸辅助肟化制备β酮酯。然后,证明了通过氟化 C C 键断裂对α-肟基-β-酮酯的解构提供了氰甲酸酯。在这种情况下,氟化物添加后 CC 键断裂选择性地发生在酮中而不是酯中。由于简单和温和的反应条件,举例说明了各种功能化的氰基甲酸酯。
Enantioselective and diastereoselective syntheses of cyanohydrin carbonates
作者:Yuri N. Belokon'、William Clegg、Ross W. Harrington、Eisuke Ishibashi、Hiroshi Nomura、Michael North
DOI:10.1016/j.tet.2007.07.016
日期:2007.9
cocatalyst are developed. Under these conditions, two chiral cyanoformates also reacted with aldehydes to give cyanohydrin carbonates. The stereochemistry of this process is predominantly determined by the stereochemistry of the titanium(salen) catalyst and the stereochemistry of two of the cyanohydrin carbonates was confirmed by X-ray crystallography. In a further extension of the chemistry, a homogeneous
Enantio- and regioselective [2 + 2 + 2] cycloaddition of BN-diynes for construction of C-B axial chirality
作者:Hao Wang、Bolin Qiao、Jide Zhu、Huosheng Guo、Zhen Zhang、Kai Yang、Shi-Jun Li、Yu Lan、Qiuling Song
DOI:10.1016/j.chempr.2023.09.017
日期:2024.1
asymmetric [2 + 2 + 2] cycloaddition of alkyne or nitrile motifs has received tremendous interest as it offers numerous possibilities to construct structurally diverse aromatic scaffolds with different chirality units. However, the use of these reactions is largely limited to symmetric alkynes, and the potential to use this strategy to design and construct chiral molecules is far from being explored