The 2-(2-Azidoethyl)cycloalkanone Strategy for Bridged Amides and Medium-Sized Cyclic Amine Derivatives in the Aubé-Schmidt Reaction
作者:John Murphy、Fraser Macleod、Stuart Lang
DOI:10.1055/s-0029-1219340
日期:2010.3
2-(2-Azidoethyl)cycloalkanones afford bridged lactams in the Aube-Schmidt reaction, sometimes in excellent yield, and solvolysis yields derivatives of medium-ring amines. Attempts to divert the Schmidt reaction with an arene-mediated fragmentation of the normal Schmidt intermediate have led to an initial example.
Reported herein is a visible‐light‐mediated radical approach to the α‐alkylation of ketones. This method exploits the ability of a nucleophilic organocatalyst to generate radicals upon SN2‐based activation of alkyl halides and blue light irradiation. The resulting open‐shell intermediates are then intercepted by weakly nucleophilic silyl enol ethers, which would be unable to directly attack the alkyl
SYNTHESIS IN THE FIELD OF THE ERYTHRINA ALKALOIDS: PART II. APPROACHES TO THE RING SYSTEM OF β-ERYTHROIDINE
作者:B. Belleau
DOI:10.1139/v57-095
日期:1957.7.1
The newly developed method for the elaboration of the ringsystem of the aromatic class of Erylhrina alkaloids has been successfully extended to the synthesis of 1,2,3,4-tetrahydroerythrinane (VI), a non-aromatic analogue. The key step in this synthesis involves ring closure of ketoamide (IV) itself, obtained from hexahydroindole and cyclohexenylacetic acid. Attempts to further extend this sequence
新开发的用于合成 Eryhrina 生物碱芳香类环系的方法已成功扩展到 1,2,3,4-四氢赤藓烷 (VI),一种非芳香类似物的合成。该合成中的关键步骤涉及从六氢吲哚和环己烯基乙酸中获得的酮酰胺 (IV) 本身的闭环。尝试将该顺序进一步扩展到使用 2H-5,6-二氢吡喃乙酸作为起始材料在后者的制备阶段遇到了失败。对图 III 所示的一种新的且不相关的逐步方法进行了研究,但在最终步骤中失败了。还简要描述了其他不成功的方法。
Ytterbium-Catalyzed Intramolecular [3 + 2] Cycloaddition based on Furan Dearomatization to Construct Fused Triazoles
development of expeditious methods to synthesize these skeletons remains a challenging task. In this work, the catalyticcyclization of biomass-derived 2-furylcarbinols with an azide to form fused triazoles is described. This approach takes advantage of a single catalyst Yb(OTf)3 and operates via a furfuryl-cation-induced intramolecular [3 + 2] cycloaddition/furan ring-opening cascade.