Formal Aminocyanation of α,β-Unsaturated Cyclic Enones for the Efficient Synthesis of α-Amino Ketones
作者:Chunrui Sun、Matthew J. O'Connor、Daesung Lee、Donald J. Wink、Robert D. Milligan
DOI:10.1002/anie.201309435
日期:2014.3.17
occurs through the formation of pyrazolines by means of a formal dipolar cycloaddition of cyclic α,β‐unsaturated ketones with lithium trimethylsilyldiazomethane followed by novel protonolytic NN bond cleavage under mild conditions. This two‐step process provides a diverse array of structurally complex free and mono‐alkylated α‐amino ketones in excellent yields.
通过直接形成CN键将氨基官能团安装在有机分子上是重要的研究目标。为了实现这一目标,开发了1,2-氨基氰化反应。发生通过由环状α的正式偶极环加成来形成吡唑啉的反应中,与锂三甲基甲硅烷β不饱和酮,接着新颖protonolyticÑ 温和的条件下N键裂解。此两步过程以优异的收率提供了各种结构复杂的游离和单烷基化α-氨基酮。