A new approach to carbazoles and benzannulated carbazoles by means of intramolecular dehydro Diels–Alder of ynamides is reported. N-(o-Ethynyl)aryl ynamides and N-(o-ethynyl) arylynamides were prepared in a few steps starting from o-iodoaniline. Thermal cycloaddition of N-(o-ethynyl)aryl ynamides and N-(o-ethynyl) arylynamides affords carbazoles and benzannulated and heteroannulated carbazoles in moderate-to-good
Bis(cycloocta-1,5-diene)nickel-Catalyzed Carbon Dioxide Fixation for the Stereoselective Synthesis of 3-Alkylidene-2-indolinones
作者:Bukeyan Miao、Yangguangyan Zheng、Penglin Wu、Suhua Li、Shengming Ma
DOI:10.1002/adsc.201700086
日期:2017.5.17
hydrocarboxylation of 2‐alkynylanilines under very mild conditions has been developed to afford (E)‐[2‐(o‐aminophenyl)]acrylic acids, which could easily be converted to (E)‐3‐alkylidene‐2‐indolinones with important potential bioactivity. The stereoselective syntheses of two biologically active molecules, (E)‐3‐benzylidene‐2‐indolinone (chemo‐preventive potential in inducing NQO1 activity) and (E)‐3‐(3‐m
The intramolecularcyclization of 2‐alkynylanilines mediated by DMSO/SOCl2 was found to afford biologically interesting 3‐methylthioindoles, which are rarely obtained by the exiting methods. DMSO could also be replaced with its deuterated counterpart, enabling the method applicable to the construction of indole skeleton bearing a SCD3 moiety at its 3‐position.
A method to synthesize benzofurylselenocyanates, benzothienylselenocyanates and indolylselenocyanates via electrophilic selenocyanogen cyclization was established. This sequential process was conducted under mild conditions in a short time. This protocol was successfully applied to late-stage functionalization of bioactive molecules. Notablely, the selenocyanate can be converted into other valuable