Rh(III)-Catalyzed Regio- and Chemoselective [4 + 1]-Annulation of Azoxy Compounds with Diazoesters for the Synthesis of 2<i>H</i>-Indazoles: Roles of the Azoxy Oxygen Atom
作者:Zhen Long、Zhigang Wang、Danni Zhou、Danyang Wan、Jingsong You
DOI:10.1021/acs.orglett.7b00631
日期:2017.6.2
tandem C–H alkylation/intramolecular decarboxylative cyclization of azoxy compounds with diazoesters for the synthesis of 3-acyl-2H-indazoles is disclosed. The azoxy instead of the azo group enables a distinct approach for cyclative capture, leading to a [4 + 1]-annulation rather than a classic [4 + 2] manner. The azoxy oxygen atom is traceless after annulation, and further removal from the product is
揭示了用Rh(III)催化的重氮化合物与重氮酸酯的串联C–H烷基化/分子内脱羧环化反应,可合成3-酰基-2 H-吲唑。取代偶氮基团的是偶氮氧基团,从而实现了一种独特的环化捕获方法,从而导致了[4 +1]环化,而不是经典的[4 + 2]方式。环氧化后,z氧基氧原子是无痕的,不需要进一步从产物中除去。该反应具有对不对称的乙氧基苯的完全区域选择性和单芳基二烯氧化物的相容性。