Efficient Carbazole Synthesis via Pd/Cu-Cocatalyzed Cross-Coupling/Isomerization of 2-Allyl-3-iodoindoles and Terminal Alkynes
摘要:
The Pd/Cu-cocatalyzed one-pot reaction of 2-allyl-3-iodo-1-tosyl-1H-indoles and terminal alkynes afforded carbazoles highly efficiently via sequential carbon carbon coupling, isomerization, cyclization, and aromatization forming a benzene ring. Both Pd and Cu are responsible for the coupling step, while K2CO3 was observed to be critical for the subsequent cyclization.
One-Pot Approach to Installing Eight-Membered Rings onto Indoles
作者:Can Zhu、Xue Zhang、Xiongdong Lian、Shengming Ma
DOI:10.1002/anie.201202971
日期:2012.7.27
Ring fusion: The Pd0‐catalyzed reaction of 2‐allyl‐3‐iodo‐1‐tosyl‐1H‐indoles and propargylic bromides affords dihydrocycloocta[b]indoles (see scheme; M.S.=molecular sieves, TFP=tris(2‐furyl)phosphine, Ts=4‐toluenemethanesulfonyl), and proceeds by carbon–carbon coupling, [1,5]‐hydrogen migration, and electrocyclization. The newly established method was used to efficiently access iprindole.
环融合:2-烯丙基-3-碘-1--1-甲苯磺酰基-1 H-吲哚与炔丙基溴的Pd 0催化反应可得到二氢环辛八烯[ b ]吲哚(参见示意图; MS =分子筛,TFP = tris(2−呋喃基膦,Ts = 4-甲苯甲磺酰基),并通过碳-碳偶合,[1,5]-氢迁移和电环化进行。新建立的方法用于有效地访问艾普琳。