Trityl Isocyanide as a Mechanistic Probe in Multicomponent Chemistry: Walking the Line between Ugi- and Strecker-type Reactions
作者:Răzvan C. Cioc、Hans D. Preschel、Gydo van der Heijden、Eelco Ruijter、Romano V. A. Orru
DOI:10.1002/chem.201600285
日期:2016.6.1
multicomponent chemistry. This reagent can be employed as a cyanide source in the Strecker reaction and as convertible isocyanide in the preparation of N‐acyl amino acids by Ugi 4CR/detritylation and free imidazo[1,2‐a]pyridin‐3‐amines by a Groebke–Blackburn–Bienaymé 3CR condensation/deprotection protocol. The mechanisms of these three classical MCRs intersect at the common N‐trityl nitrilium ion intermediate
Nano magnetic sulfated zirconia (Fe<sub>3</sub>O<sub>4</sub>@ZrO<sub>2</sub>/SO<sub>4</sub><sup>2−</sup>): an efficient solid acid catalyst for the green synthesis of α-aminonitriles and imines
In this research, nano magnetic sulfated zirconia was prepared through a green and facile method and acted as a novel, heterogeneous, efficient nano-catalyst for the one-pot three component synthesis of α-aminonitrile derivatives.
Aqueous formic acid: an efficient, inexpensive and environmentally friendly organocatalyst for three-component Strecker synthesis of α-aminonitriles and imines with excellent yields
作者:Hossein Ghafuri、Mahdi Roshani
DOI:10.1039/c4ra11957f
日期:——
Aqueous formic acid (37%) was effectively used as catalyst in Strecker reaction to afford α-aminonitriles and imines in high yields.
been developed for the synthesis of a series of α-aminonitriles via the one-pot three-component Strecker reactions between various aldehydes, amines and trimethylsilyl cyanide using a catalytic amount of mandelic acid as a naturally occurring, low-cost, efficient organo-catalyst undersolvent-freeconditions at room temperature. Under the same optimized conditionssynthesis of α-aminophosphonates were
Synthesis of α‐Aminonitriles and 5‐Substituted 1<i>H</i>‐Tetrazoles Using an Efficient Nanocatalyst of Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>–APTES‐supported Trifluoroacetic Acid
nanocatalyst was used for the one‐potsynthesis of α‐aminonitriles via a three‐component reaction of aldehydes (or ketones), amines, and sodium cyanide. This method produced a high yield of 75–96% using only a small amount of the catalyst (0.05 g) in EtOH at room temperature. The catalyst was also employed for the synthesis of 5‐substituted 1H‐tetrazoles fromnitriles and sodium azide in EtOH at 80°C
Fe 3 O 4 @SiO 2 -APTES负载的三氟乙酸纳米催化剂通过醛(或酮),胺和氰化钠的三组分反应用于一锅法合成α-氨基腈。在室温下,仅在EtOH中仅使用少量催化剂(0.05 g),该方法可产生75-96%的高收率。该催化剂还用于合成5个取代的1 H来自腈和叠氮化钠的乙腈在80°C的乙醇中。在短短的4小时反应时间内,四唑类化合物的产量就达到了优异的水平。两种合成方法均在有机挥发性溶剂不存在的情况下进行。由于负载的三氟乙酸在表面上生成固体酸,因此酸腐蚀性不是一个严重的挑战。该多相纳米催化剂被磁性回收并重复使用了几次,而催化活性没有明显损失。