One-Step Synthesis of 3-Aryl- and 3,4-Diaryl-(1<i>H</i>)-Pyrroles Using Tosylmethyl Isocyanide (TOSMIC)
作者:Nicholas D. Smith、Dehua Huang、Nicholas D. P. Cosford
DOI:10.1021/ol0267073
日期:2002.10.1
[GRAPHICS]A one-step synthesis of 3-aryl and 3,4-diaryl-(1H)-pyrroles from TOSMIC and commercially available or readily synthesized arylalkenes is reported. Optimal conditions were found to be NaOtBu in DMSO. The methodology was particularly efficient (yields > 65%) when electron poor aryl groups were attached to the alkene.
Synthesis of IR-sensitive photoswitchable molecules: photochromic 9?- styrylquinolinedihydroindolizines
作者:Saleh A. Ahmed、Thomas Hartmann、Volker Huch、Heinz D�rr、Aboel-Magd A. Abdel-Wahab
New mono-(5a-t, w) and biphotochromic (5u, v) 9'-styrylquinolinespirodihydroindolizines (DHIs) with IR-absorbing colored forms (4) were prepared. The conformation and configuration of these new DHIs were investigated by NMR studies and the structure was proved by x-ray analysis. The kinetics of the fast cyclizing process of betaine 4 to DI-II 5 takes place in the millisecond range and were studied by flash photolysis. The absorption bands of the betaines 4 were recorded at low temperature by FT-UV/VIS/near-IR spectroscopy. Large solvent effects on the absorption maxima of betaines 4 were observed. Copyright (C) 2000 John Wiley & Sons, Ltd.
The Addition of Benzene to Benzalquinaldines and Benzallepidines
作者:Reynold C. Fuson、L. L. Alexander、Ellsworth Ellingboe、Arnold Hoffman