氰基硼氢化物是烷基碘化物和缺电子烯烃的还原加成反应中的有效试剂。与使用锡试剂相反,该反应在碳碘键上发生化学选择,而在碳溴或碳氯键上没有发生。该反应体系已成功应用于三组分反应,包括自由基羰基化。通过动力学竞争法,在25°C下从氰基硼氢化四丁基铵中伯烷基脱氢的速率常数估计为<1×10 4 M –1 s –1。该值比氢化三丁基锡的值小3个数量级。
Tin-free Giese reaction and the related radical carbonylation process proceeded efficiently in the presence of sodium cyanoborohydride and tetrabutylammonium cyanoborohydride. The reaction took place chemoselectively at the carbon-iodine bond but not at the carbon-bromine and carbon-chlorine bonds. The iodine atom transfer followed by hydride reduction of the resulting carbon-iodine bond is proposed
A catalytic enantioselective transacetalization has been developed. The chiral phosphoric acid TRIP was demonstrated to be an efficient and highly enantioselective catalyst for the activation of O,O-acetals. The reaction enables the asymmetric synthesis of acetals with the acetal carbon as the only stereogenic center.
Schmidt,U.; Grafen,P., Justus Liebigs Annalen der Chemie, 1962, vol. 656, p. 97 - 102
作者:Schmidt,U.、Grafen,P.
DOI:——
日期:——
Synthesis of 2,3-Substituted Cycloalkanones by Ceric Ammonium Nitrate-Promoted Oxidative Tandem Additions of 1-Ethoxy-1-[(Trimethylsilyl)oxy]cyclopropane to α,β-Unsaturated Cycloalkenones
作者:Anna Belli Paolobelli、Renzo Ruzziconi
DOI:10.1021/jo960446r
日期:1996.1.1
Piacenti,F. et al., Gazzetta Chimica Italiana, 1968, vol. 98, p. 235 - 244