route to rare spiro-3H-indazoles bearing a carbonyl group adjacent to the spirocyclic quarternary carbon via 1,3-dipolar cycloaddition reaction of arynes with 6-diazocyclohex-2-en-1-one derivatives under mild conditions has been developed. Further transformation of these unique spiro-3H-indazoles via an acid- or heat-mediated rearrangement to fused-2H-indazoles and an interesting reduction/ring-opening/reduction
                                    到罕见螺-3 A路线ħ -indazoles轴承邻近于螺季碳的羰基通过arynes的1,3-偶极环加成反应与6- diazocyclohex -2-烯-1-酮在温和条件下的衍
生物已被开发。还描述了通过酸或热介导的重排将这些独特的螺-3 H-
吲唑进一步转化为稠合的2 H-
吲唑和令人感兴趣的还原/开环/还原序列。