A cyanide‐free platform technology for the synthesis of chiral nitriles by biocatalytic enantioselective dehydration of a wide range of aldoximes is reported. The nitriles were obtained with high enantiomeric excess of >90 % ee (and up to 99 % ee) in many cases, and a “privileged substrate structure” with respect to high enantioselectivity was identified. Furthermore, a surprising phenomenon was observed
Abstract The reaction of a variety of aldoximes with perfluoroalkanosulfonyl fluoride in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in dichloromethane smoothly generated the corresponding nitriles in 70%–95% yields.
Cascade Process for Direct Transformation of Aldehydes (RCHO) to Nitriles (RCN) Using Inorganic Reagents NH<sub>2</sub>OH/Na<sub>2</sub>CO<sub>3</sub>/SO<sub>2</sub>F<sub>2</sub> in DMSO
作者:Wan-Yin Fang、Hua-Li Qin
DOI:10.1021/acs.joc.8b03164
日期:2019.5.3
and practical process for direct conversion of aldehydes to nitriles was developed feathering a wide substrate scope and great functional group tolerability (52 examples, over 90% yield in most cases) using inorganic reagents (NH2OH/Na2CO3/SO2F2) in DMSO. This method allows for transformations of readily available, inexpensive, and abundant aldehydes to highly valuable nitriles in a pot, atom, and
使用无机试剂(NH 2 OH / Na 2 CO )开发了一种简单,温和且实用的方法,将醛直接转化为腈,可在较宽的底物范围内实现出色的官能团耐受性(52个实例,大多数情况下产率超过90%)3 / SO 2 F 2)在DMSO中。该方法允许以易用,原子和步经济的方式将易于获得,廉价且丰富的醛转化为高度有价值的腈,而无需过渡金属。该协议将作为将氰基部分安装到复杂分子的强大工具。
X=Y-ZH systems as potential 1,3-dipoles. Part 33. Generation of nitrones from oximes. Tandem Michael addition-1,3-dipolar cycloaddition reactions. Class 2 processes in which the dipolarophile is located within the oxime.
corresponding C-alkenyl nitrones which undergo an intramolecular cycloaddition. The cycloaddition can occur by one of two modes leading to either bridged- or fused-isoxazolidines. The latter is preferred in most cases except that of the C-(3-alkenyl) nitrone which gives exclusively the bridged-ring product and the C-(4-alkenyl)nitrones derived from N-allylpyrrole-2-carboxyaldehyde oxime which gives both bridged-
Tin or gallium-catalyzed cyanide-transition metal-free synthesis of nitriles from aldehydes or oximes
作者:Yan-Jun Zhuang、Jie Liu、Yan-Biao Kang
DOI:10.1016/j.tetlet.2016.11.034
日期:2016.12
Tin or gallium chloridecatalyzed transformation of oximes or aldehydes to nitriles is described. Various nitriles were obtained in up to 99% of yields. The gram-scale reaction or the optically active dinitrile was also available. This synthetically useful method has avoided toxic organic or inorganic cyanides as well as transition or noble metal catalysts.