through CNbondcleavage. In the presence of 5 mol% palladium diacetate, 10 mol% 1,4‐bis(diphenylphosphino)butane (dppb), and 5 mol% p‐toluenesulfonic acid (TsOH), a range of α‐unbranched primary allylic amines smoothly underwent deammoniative condensation with nonallylic amines in an α‐selective fashion to give structurally diverse secondary and tertiary amines in good to excellent yields and E selectivity
Iridium-Catalyzed, Asymmetric Amination of Allylic Alcohols Activated by Lewis Acids
作者:Yasuhiro Yamashita、Apsara Gopalarathnam、John F. Hartwig
DOI:10.1021/ja0730718
日期:2007.6.1
enantioselective amination of allylic alcohols with Lewis acid activators to form branched allylic amine products is reported. The reactions of arylamines, benzylic amines, and secondary aliphatic amines in the presence of Nb(OEt)5 as activator occurred with high regioselectivities and high enantioselectivities. These results led to the development of Ir-catalyzed reactions of allylic alcohol with arylamines
报道了烯丙醇与路易斯酸活化剂的直接、Ir 催化、区域和对映选择性胺化反应,形成支链烯丙胺产物。在 Nb(OEt)5 作为活化剂存在下,芳胺、苄胺和脂肪仲胺的反应具有高区域选择性和高对映选择性。这些结果导致了烯丙醇与芳胺和 BPh3 作为催化量的活化剂的 Ir 催化反应的发展。这些反应是烯丙醇对映选择性取代的罕见例子。它们是烯丙醇取代以从单取代烯丙醇产生支化取代产物以及烯丙醇与胺亲核试剂的对映选择性取代的特别不寻常的例子。
Visible-light-mediated decarboxylative (<i>E</i>)-alkenylation of aliphatic carboxylic acids with aryl styryl sulfones under metal-free conditions
作者:Sarah-Jayne Burlingham、David Guijarro、Irene Bosque、Rafael Chinchilla、Jose C. Gonzalez-Gomez
DOI:10.1039/d2ob01360f
日期:——
The decarboxylative alkenylation of aliphatic carboxylicacids with aryl styryl sulfones is efficiently catalyzed by riboflavin tetraacetate under visiblelight irradiation at room temperature. This metal-free protocol is cost-efficient, environmentally friendly and provides the corresponding olefins with excellent (E)-diastereocontrol. The methodology can also be used to prepare internal alkynes regioselectively
在室温下可见光照射下,核黄素四乙酸酯有效地催化了脂肪族羧酸与芳基苯乙烯基砜的脱羧烯基化反应。这种无金属方案具有成本效益、环境友好,并为相应的烯烃提供出色的 ( E )-非对映控制。该方法还可用于通过使用炔基砜作为自由基受体来区域选择性地制备内部炔烃。通过进行 ( E ) 到 ( Z ) 光异构化、铁催化的由 2-苯氧基羧酸底物衍生的苯氧基的烯丙基取代,以及合成-环氧化和非对映选择性分子内碘芳基化。基于对照实验和 DFT 计算,我们提出了一种反应机制,可以解释观察到的区域选择性和非对映选择性。