A new synthesis of 4-OR-3-penten-1-ynes (C5-fragment) as a tool for the preparation of vitamin A
作者:M. S. Brouwer、A. Hulkenberg、J. G. J. Kok、R. van Moorselaar、W. R. M. Overbeek、P. G. J. Wesselman
DOI:10.1002/recl.19790980513
日期:——
is prepared by the reaction of 1,3-dichloro-2-propanol with ethyl vinyl ether, followed by dehydrohalogenation, substitution and isomerisation of the resulting mixedacetal (17i) in a simple one-pot procedure by treatment with sodium acetylide. The syntheses of several C5-synthons of type 8 with different groups R are described. The condensation product of 1 and 8i is partially hydrogenated and subsequently