AbstractA palladium(0)‐catalyzed reaction of 2‐allyl‐3‐indolyl boronates/propargylic carbonates was observed to afford dihydrocycloocta[b]indoles highly efficiently via carbon‐carbon coupling, [1,5]‐hydrogen migration involving dearomatization, and electrocyclization involving rearomatization. Their thermal reactions with the addition of dienophiles involving eletrocyclization and [4+2] cycloaddition have been studied.magnified image
iodine-magnesium exchange. In many cases, the exchange can be extended to heteroaryl bromides, and a case of a chlorine-magnesium exchange is described with tetrachlorothiophene. This new preparation of functionalized heteroarylmagnesium compounds provides after reaction with various electrophiles a new entry to a broad range of polyfunctional pyridines, imidazoles, furanes, thiophenes, pyrroles, antipyrines
Efficient Carbazole Synthesis via Pd/Cu-Cocatalyzed Cross-Coupling/Isomerization of 2-Allyl-3-iodoindoles and Terminal Alkynes
作者:Can Zhu、Shengming Ma
DOI:10.1021/ol500119r
日期:2014.3.21
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.
Studies on Palladium-Catalyzed Synthesis of Dihydrocycloocta- [<i>b</i>]indoles and their Thermal Reactivities with Maleimide or Maleic Anhydride
作者:Can Zhu、Shengming Ma
DOI:10.1002/adsc.201400644
日期:2014.12.15
AbstractA palladium(0)‐catalyzed reaction of 2‐allyl‐3‐indolyl boronates/propargylic carbonates was observed to afford dihydrocycloocta[b]indoles highly efficiently via carbon‐carbon coupling, [1,5]‐hydrogen migration involving dearomatization, and electrocyclization involving rearomatization. Their thermal reactions with the addition of dienophiles involving eletrocyclization and [4+2] cycloaddition have been studied.magnified image
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。