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。
Inside-Outside Stereoisomerism. 6.+ Synthesis of trans-Bicyclo[4.4.1]undecan-11-one and the First Stereoselective Construction of the Tricyclic Nucleus of the Ring System of the Ingenane Diterpenes
作者:Jeffrey D. Winkler、Kevin E. Henegar、Bor-Cherng Hong、Paul G. Williard
DOI:10.1021/ja00089a006
日期:1994.5
The intramolecular dioxenone photocycloaddition reaction provides access to compounds which in many cases cannot be otherwise prepared. The application of this methodology to the construction of trans-bicyclo[4.4.1]undecan-11-one, 16, which is ca. 10 kcal/mol more strained than the corresponding cis-bridged isomer, is described. The extension of this preliminary result to the first synthesis of the tricyclic ingenane nucleus with the requisite ''inside-outside'' or trans intrabridgehead stereochemical relationship is reported.
Inside-outside stereoisomerism. II. Synthesis of the carbocyclic ring system of the ingenane diterpenes via the intramolecular dioxolenone photocycloaddition
作者:Jeffrey D. Winkler、Kevin E. Henegar、Paul G. Williard
DOI:10.1021/ja00243a062
日期:1987.4
A new method for the synthesis of dioxolenones the carboxylation of ketone enolates with anisyl cyanoformate
作者:Kevin E Henegar、Jeffrey D Winkler
DOI:10.1016/s0040-4039(00)95908-2
日期:1987.1
depends on the availability of the requisite functionalized dioxolenones. We report herein a general approach to the preparation of dioxolenones, via carboxylation of ketone enolates with anisyl cyanoformate and condensation of the resulting ketoesters with acetone.
An expedient synthesis of cyanoformates via DAST-mediated C C bond cleavage of α-oximino-β-ketoesters
作者:Danhee Kim、Hee Nam Lim
DOI:10.1016/j.tetlet.2021.153116
日期:2021.6
A new protocol to synthesize cyanoformates was developed using simple β-ketoesters as substrates. (Diethylamino)sulfur trifluoride (DAST) was used as a dual-role reagent to activate the oxime moiety and to donate a fluoride. The key intermediates, α-oximino-β-ketoesters, were prepared by highly efficient acid-assisted oximation of β-ketoesters. Then, the deconstruction of α-oximino-β-ketoesters by
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。