Acid-promoted Cascade Cyclization to Produce Fused-polycyclic Indole Derivatives
摘要:
An acid-promoted novel cascade cyclization is described. Using 8 equiv of trifluoroacetic acid or a catalytic amount of Lewis acid as the promoter, structurally diverse polycyclic cyclopenta[b]indoles were obtained in moderate to excellent yield. This cascade process was extremely effective for the synthesis of 8-membered ring-fused cyclopenta[b]indole derivatives.
γ-Lactams were synthesized from N-tosylhomoallylamines by a carbonylation reaction catalyzed by palladium and copper salts under the normal pressure of CO and O2 at room temperature. Monocarbonylation proceeded by the use of [PdCl2(CH3CN)2] and CuCl2 to afford 3-methyl-2-pyrrolidones, while the use of PdCl2 and CuCl switched the reaction from monocarbonylation to dicarbonylation to produce alkyl 2
One‐Step Synthesis of the 1‐Azaspiro[5.5]undecane Skeleton Characteristic of Histrionicotoxin Alkaloids from Linear Substrates via Hg(OTf)
<sub>2</sub>
‐Catalyzed Cycloisomerization
possess a unique structure characterized by a 1-azaspiro[5.5]undecane skeleton common to the HTX family. The unique molecular architecture of HTXs and the interest as potential target drugs have prompted synthetic chemists to promote the total synthesis so far. However, all of the synthetic strategies to access the 1-azaspiro[5.5]undecane framework of HTXs take a multistep approach from linear starting
A novel macrotricyclic receptor for the inclusion of fluoride ion
作者:Mohammed A. Hossain、Kazuhiko Ichikawa
DOI:10.1016/s0040-4039(00)74415-7
日期:1994.11
A novel macrotricyclic receptor 1 with hydrocarbon chain of (CH2)(5) has been synthesized and the F-19 NMR study on the aqueous solution of 1 shows the single coordination geometry of the encapsulated fluoride ion.