- Synthesis of 4-Arylidenepyrazolones by a Gold-Catalyzed Cyclization/Arylidene Group Transfer Cascade of N-Propioloyl Hydrazones
-
An efficient gold-catalyzed cyclization/arylidene group transfer cascade reaction of N-propioloyl hydrazones has been developed. This method provides a novel approach for the synthesis of various functionalized 4-arylidenepyrazolones.
- Ding, Zong-Cang,Tang, Hai-Tao,Li, Ren-Hao,Ju, Lu-Chuan,Zhan, Zhuang-Ping
-
p. 9307 - 9313
(2015/09/28)
-
- Ethynylogization of a coarctate fragmentation
-
Coarctate reactions form a separate class of elementary closed-shell processes in addition to polar and pericyclic reactions. Hence, they also follow a different homology principle. Whereas vinylogous polar and pericyclic reactions differ in the length of the reacting system by a double bond, coarctate reactions can be homologized (ethynylogized) by extending a known system by a triple bond. The prediction, which is based on theoretical considerations, is confirmed experimentally by the fragmentation of cyclopropylethynyl nitrene to cyano acetylene and ethylene, a reaction that is "ethynyloguous" to the known fragmentation of cyclopropyl nitrene to ethylene and HCN.
- Herges, Rainer,Geuenich, Daniel,Bucher, Goetz,Toenshoff, Christina
-
p. 1224 - 1228
(2007/10/03)
-