The oxidation of ketone hydrazones by iodine in the presence of a base to furnish vinyliodides has been considerably improved. The three factors responsible are (1) absence of water, (2) the use of strong guanidine bases and (3) inverse addition.
Synthesis of Bridgehead Derivatives; 2. Preparation of 1-Substituted Bicyclo[2.2.1]heptanes
作者:A. García Martínez、E. Teso Vilar、J. Coterón López、J. Manrique Alonso、M. Hanack、L. R. Subramanian
DOI:10.1055/s-1991-26463
日期:——
The reaction of bridgehead trifluoromethanesulfonates 1- and 4-trifluoromethylsulfonyloxycamphene (1a,b) with magnesium iodide or magnesium bromide in carbon disulfide yields the corresponding halides 2 and 3. The reaction time was reduced by sonication. The 1-(2-cyanoethyl)- and 2-methoxycarbonylethyl) -camphenes 6a and 7a, and the corresponding 4-substituted analogue 6b and 7b are prepared by radical addition of 2a and 2b to methyl acrylate (4) or acrylonitrile (5), respectively.