Fe(OTf)2 was used to catalyze the insertionreaction of α-diazocarbonyls into S–H bonds at 40 °C. A wide range of α-thioesters were obtained in yields up to 96% within 24–48 h from their corresponding α-diazoesters. A variety of thiols were used for the unprecedented insertionreaction with an α-diazoketone, leading to yields up to 85% of α-thioketones.
An efficient copper-catalyzedcarbenoidinsertion reaction of α-diazo carbonyl compounds into Si–H and S–H bonds was developed. A wide range of α-silylesters and α-thioesters was obtained in high yields (up to 98%) from α-diazoesters using 5 mol% of a simple copper(I) salt as catalyst. Using 0.05 mol% of the same catalyst, α-diazoketones led to α-silylketones in low to good yields (up to 70%).
Controllable construction of isoquinolinedione and isocoumarin scaffolds <i>via</i> Rh<sup>III</sup>-catalyzed C–H annulation of <i>N</i>-tosylbenzamides with diazo compounds
An efficient protocol for the synthesis of isoquinolinediones by RhIII-catalyzed C–H activation/annulation/decarboxylation of N-tosylbenzamides with diazo compounds is reported.
Nonracemic ethano-bridged Tröger bases are prepared using CuTC-catalyzed decompositions of diazo compounds. Excellent levels of diastereo- and enantio-control (dr and ee up to 12 : 1 and 95% respectively) are now obtained with aryl diazoketone precursors.
Rhodium(II)-Catalyzed Cross-Coupling of Diazo Compounds
作者:Jørn H. Hansen、Brendan T. Parr、Philip Pelphrey、Quihui Jin、Jochen Autschbach、Huw M. L. Davies
DOI:10.1002/anie.201004923
日期:2011.3.7
left to chance: A convenient protocol for selective cross‐coupling of diazocompounds for the convergent synthesis of alkenes was developed (see scheme; EDG=aryl, heteroaryl, vinyl; R=O‐alkyl, aryl). The selectivity control elements were identified by ReactIR and DFT calculations and provide a framework for the design of viable diazo coupling reactions.
没事了:开发了用于重氮合成烯烃的重氮化合物选择性交叉偶联的便捷方案(见方案; EDG =芳基,杂芳基,乙烯基; R = O-烷基,芳基)。通过ReactIR和DFT计算确定了选择性控制元素,并为可行的重氮偶合反应设计提供了框架。