Cyclizations of Aminyl Radicals Generated from Substoichiometric Stannane
作者:Glenn Sammis、Huimin Zhai、Jason Wickenden
DOI:10.1055/s-0030-1259062
日期:2010.12
Substoichiometric amounts of tributyltin hydride were utilized in nitrogen-centered radical cyclizations onto silyl enol ethers for the formation of substituted cyclic imines.
在以氮为中心的自由基环化硅基烯醇醚过程中,使用了亚几何量的三丁基氢化锡,以形成取代的环状亚胺。
Iron-Catalyzed Ring-Opening Azidation and Allylation of <i>O</i>-Heterocycles
We have established the first catalytic C-C and C-N bond formation reactions of O-heterocycles (e.g., tetrahydrofuran, phthalane, and lactone derivatives) using iron bichloride as a catalyst in the presence of TMSN3 or allylsilanes accompanied by the ring opening of O-heterocycles. The reactions smoothly proceeded at room temperature to give the corresponding primary saturated alcohols from the 2-substituted tetrahydrofurans, ortho-substituted benzyl alcohols from phthalanes, and saturated carboxylic acids from lactones in high yields.
An expedient and highly selective conversion of alcohols to azides using a system
The cyclization of nitrogen-centered radicals onto silyl enol ethers is an efficient method for the synthesis of polyhydroxylated alkaloids as the 2-hydroxymethylpyrrolidine core can be readily accessed from a linear precursor. During our studies on the synthesis of polyhydroxylated alkaloid CYB-3, we found that the diastereoselectivity of the cyclization was dependent on a complex combination of sterics