First General Method for Direct Formylation of Kinetically-Generated Ketone Enolates
摘要:
[GRAPHICS]2,2,2-Trifluoroethyl formate reacts rapidly at -78 degrees C with preformed ketone enolates to give alpha-formyl ketones in good yields. In addition, this procedure allows for complete reversal of the regioselectivity of the classical Claisen reaction and provides a superior method for the alpha'-formylation of alpha,beta-unsaturated ketones.
Bicyclic salicylates were prepared by [3+3] cyclization of 1,3-bis(silylenolethers) with cyclic 3-(silyloxy)alk-2-en-1-ones. Graphical Abstract Synthesis of Bicyclic Salicylates by [3+3] Cyclization of 1,3-Bis(SilylEnolEthers) with Cyclic 3-(Silyloxy)alk-2-en-1-ones
Zur Reaktionsweise von Enaminen mit Cyclopropenonen I. Einsatz von Cyclododecanon-Enamin
作者:M. A. Steinfels、A. S. Dreiding
DOI:10.1002/hlca.19720550247
日期:1972.1.31
Monomethyl-, dimethyl-, di-n-propyl- and diphenyl-cyclopropenone (6 to 9) have been reacted with 1-(N-pyrrolidino)-cyclododecene (5) and three types of products isolated.