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。