Visible-Light-Mediated ipso-Carbosulfonylation of Alkynes: Synthesis of 3-Sulfonylspiro[4,5]trienones from Propiolamides and Sulfonyl Chlorides under Transition-Metal-Free Conditions
sulfonylation and ipso-cyclization of alkynes. In this transformation, the O atom in the newly generated carbonyl is derived from H2O and it features a broad substrates scope, especially for alkyl propiolamides and aliphatic sulfonyl chlorides.
已开发出一种高效便捷的合成多种 3-磺酰基螺[4,5] 三烯酮的策略。这种炔烃的同位碳磺酰化在无过渡金属条件下通过可见光催化进行,代表了炔烃的新磺酰化和同位环化。在这种转化中,新生成的羰基中的 O 原子来源于 H2O,它具有广泛的底物范围,特别是对于烷基丙酰胺和脂肪族磺酰氯。
Visible-light promoted one-pot synthesis of sulfonated spiro[4,5]trienones from propiolamides, anilines and sulfur dioxide under transition metal-free conditions
A novel visible-light promoted sulfonylation/ipso-cyclization of N-arylpropiolamides with aromatic amines and DABCO·(SO2)2 to synthesize various sulfonated spiro[4,5]trienones is reported.
Visible-Light-Mediated <i>Ipso</i>-Carboacylation of Alkynes: Synthesis of 3-Acylspiro[4,5]trienones from <i>N</i>-(<i>p</i>-Methoxyaryl)propiolamides and Acyl Chlorides
A novel visible-light-mediated ipso-carboacylation of N-(p-methoxyaryl)propiolamides with acyl chloride has been established for the synthesis of diverse 3-acylspiro[4,5]trienones with high selectivity and efficiency. This method represents a new difunctionalization of alkynes through cross coupling of the acyl chloride C–Cl bonds with an ipso-aromatic carbon by simultaneously forming two new carbon–carbon
Copper-Catalyzed Tandem Reaction of Isocyanides with <i>N</i>-(2-Haloaryl)propiolamides for the Synthesis of Pyrrolo[3,2-<i>c</i>]quinolin-4-ones
作者:Fengtao Zhou、Jianguang Liu、Ke Ding、Jinsong Liu、Qian Cai
DOI:10.1021/jo2006939
日期:2011.7.1
The copper-catalyzedtandemreaction of isocyanides with N-(2-haloaryl)propiolamides is very efficient for the synthesis of pyrrolo[3, 2-c]quinolin-4-ones. Highly reactive cyclic organocopper intermediates were proposed to be generated in the copper-catalyzed formal [3 + 2] cycloaddition reaction of isocyanides with triple bonds. Intramolecular trapping of the organocopper intermediates can lead to
铜催化的异氰酸酯与N-(2-卤代芳基)丙酰胺的串联反应对于合成吡咯并[3,2 - c ]喹啉-4-酮非常有效。有人提出,在具有三键的异氰酸酯的铜催化形式[3 + 2]环加成反应中会生成高反应性的环状有机铜中间体。分子内捕获有机铜中间体会导致芳基碳键的形成,这为构建稠合吡咯结构提供了一种有效的方法。
Copper-Catalyzed Oxidative ipso-Cyclization of N-(p-Methoxyaryl)propiolamides with Disulfides and Water Leading to 3-(Arylthio)-1-azaspiro[4.5]deca-3,6,9-triene-2,8-diones
A new copper-catalyzed oxidative ipso-cyclization of N-(p-methoxyaryl)propiolamides with disulfides for the synthesis of 3-(arylthio)-1-azaspiro[4.5]deca-3,6,9-triene-2,8-diones has been developed. This method proceeds via sequential oxidative C-S bond formation, ipso-cyclization, and dearomatization and provides a new facile oxidative strategy to assemble the target products using an inexpensive catalytic system comprising copper(II) chloride and molecular oxygen.