Abstract A highly regio‐ and stereoselective hetero Diels–Alder cycloaddition of indene with N‐sulfonyl‐1‐aza‐1,3‐butadiene was achieved. Subsequent transformation of the 5H‐indeno [l,2‐b]pyridine via elimination and reduction provides a new route to azafluorenone (e.g., 1‐methyl‐4‐azafluorene) for the synthesis of onychnine.
摘要 实现了
茚与 N-磺酰基-1-氮杂-
1,3-丁二烯的高度区域和立体选择性杂Diels-Alder 环加成反应。5H-
茚并[l,2-b]
吡啶通过消除和还原的后续转化为氮杂
芴酮(例如,1-甲基-4-氮杂
芴)的合成提供了一条新途径。