Asymmetric trimethylsilylcyanation of aldehydes utilizing chiral bismuth compounds. A frontier in bismuth mediated synthetic reactions
作者:Makoto Wada、Toshikazu Takahashi、Terutomo Domae、Tomohiro Fukuma、Norikazu Miyoshi、Keith Smith
DOI:10.1016/s0957-4166(97)00570-3
日期:1997.12
found to work efficiently as a versatile catalyst for cyanation of aldehydes with trimethylsilyl cyanide to afford the corresponding cyanohydrins in high yields. Triphenylbismuthan (Ph3Bi) is also effective. The reaction has been applied to the asymmetric cyanation of a variety of aldehydes in high yields with moderate to good enantioselectivities by use of a chiral bismuth catalyst prepared in situ
Ionic liquid [omim][PF6] as an efficient and recyclable reaction media for the cyanosilylation of aldehydes without Lewis acid or any special activation
作者:Zhi-Liang Shen、Shun-Jun Ji、Teck-Peng Loh
DOI:10.1016/j.tetlet.2005.01.177
日期:2005.4
Ionicliquid [omim][PF6] has been demonstrated as an efficient and environmentally friendly reaction media as well as a promoter for the cyanosilylation of aldehydes under mild conditions. In addition, the recovered ionicliquid could be reused for subsequent runs with only a gradual decrease in activity.
The absoluterateconstants for the addition of alkyl radicals to acrylonitrile and methyl acrylate are determined by evaluating the ratio of ligand-transfer oxidation and addition to the double bond. Secondary alkyl radials appear to be more reactive than primary alkyl radicals, despite the less favourable energetics. The classical selectivity : reactivity relationship is reversed owing to the nucleophilic
The N-Aluminium imines derived fromcyanohydrins have been used in the synthesis of α-amino alcohols with high diastereoselectivity.
衍生自氰醇的N-铝亚胺已用于合成具有高非对映选择性的α-氨基醇。
Alkali Salt of L-Proline as an Efficient and Practical Catalyst for the Cyanosilylation of a Wide Variety of Carbonyl Compounds Under Solvent-Free Conditions
作者:Zhi-Liang Shen、Shun-Jun Ji
DOI:10.1080/00397910802431149
日期:2009.2.9
Abstract The alkali salt of L-proline was demonstrated to be an efficient and practical catalyst for the cyanosilylation of a wide variety of simple and functionalized carbonylcompoundsundersolvent-freeconditions. The reactions proceeded smoothly at room temperature to afford the corresponding cyanohydrins in good to excellent yields.