Efficient Pathway for the Preparation of Aryl(isoquinoline)iodonium(III) Salts and Synthesis of Radiofluorinated Isoquinolines
作者:Zheliang Yuan、Ran Cheng、Pinhong Chen、Guosheng Liu、Steven H. Liang
DOI:10.1002/anie.201606381
日期:2016.9.19
to assemble aryl(isoquinoline)iodonium salts in 40–94 % yields from mesoionic carbene silver complex and Aryl‐I‐Py2(OTf)2. The method is general, practical, and compatible with well‐functionalized molecules as well as useful for the preparation of a wide range of 18F‐labeled isoquinolines resulting in up to 92 % radiochemical conversion. As proof of concept, a fluorinated isoquinoline alkaloid, 18F‐aspergillitine
heterocyclization/alkoxycarbonylation of readily available (2-alkynylbenzylidene)amine derivatives. In particular, (2-alkynylbenzylidene)(tert-butyl)amines 2 selectively afforded isoquinolinederivatives 3 by N-cyclization, whereas N-(2-alkynylbenzylidene)-N′-phenylhydrazines 5 led to the formation of isochromenes 4 through O-cyclization ensuing from water attack on the imino group of the substrate
One-Pot Synthesis of 1-(Trifluoromethyl)-4-fluoro-1,2-dihydroisoquinolines and 4,4-Difluoro-1,2,3,4-tetrahydroisoquinolines
作者:Qilun Liu、Yichen Wu、Pinhong Chen、Guosheng Liu
DOI:10.1021/ol403059z
日期:2013.12.20
A cascade approach to 1-(trifluoromethyl)-4-fluoro-1,2-dihydroisoquinolines and 4,4-difluorotetrahydroisoquinolines has been developed. The procedure involves a silver-catalyzedintramolecularaminofluorination of alkyne. This one-pot reaction provides an efficient way to synthesize various fluorinated isoquinolines.
Rh(III)-Catalyzed Domino [4 + 2] Annulation/Aza-Michael Addition of <i>N</i>-(Pivaloyloxy)benzamides with 1,5-Enynes via C–H Activation: Synthesis of Functionalized Aromathecins
Reported herein are the Rh(III)-catalyzedcascadeannulation reactions of N-(pivaloyloxy)benzamides with 1,5-enynes to access diversely substituted aromathecin derivatives involving C–H activation. The developed procedure offers an efficient synthetic tool for the assembly of a wide range of N-(pivaloyloxy)benzamides and 1,5-enynes with good atom economy and functional group tolerance. The key reactions
Imidazolidine Hydride Donors in Palladium-Catalyzed Alkyne Hydroarylation
作者:Soe L. Tun、S. V. Santhana Mariappan、F. Christopher Pigge
DOI:10.1021/acs.joc.2c00725
日期:2022.6.17
were converted to trisubstituted alkenes via a syn hydroarylation process, while a terminal alkyne was converted to a cis alkene via a formal trans hydroarylation reaction. Benzanilide products could be converted to carboxylic acidderivatives under basic conditions, resulting in the net conversion of alkynyl aldehydes to alkenyl carboxylic acids. A styrene derivative with an attached N,N′-dimethylbenzimidazoline
醛衍生的咪唑烷作为氢化物供体参与分子内还原 Heck 型反应。由邻-炔基苯甲醛制备的N , N ' -二苯基咪唑烷经过区域选择性和立体选择性钯催化加氢芳基化,然后进行形式 1,5-氢化物转移和还原消除,得到取代的烯烃和咪唑部分,后者方便地原位转化为环-打开苯甲酰苯胺以简化产品分离。内部炔烃通过顺式加氢芳基化过程转化为三取代烯烃,而末端炔烃通过形式反式转化为顺式烯烃加氢芳基化反应。苯甲酰苯胺产物可以在碱性条件下转化为羧酸衍生物,导致炔基醛净转化为烯基羧酸。还发现具有连接的N,N'-二甲基苯并咪唑啉氢化物供体的苯乙烯衍生物经历类似的氢化芳基化/苯并咪唑啉氧化,得到二芳基乙烷产物。