Robinson annulation of 2-hydroxymethylene-ketones. A new route to spiro-diketones
作者:V. Dave、J. S. Whitehurst
DOI:10.1039/p19730000393
日期:——
The adducts formed from methyl vinyl ketone and the 2-hydroxymethylene derivatives of cyclic ketones of ring sizes 5, 6, 7, and 1 2 have been cyclised to spiro-ketones containing the same number of carbon atoms. Cyclisation under mild conditions gives ketols, the constitution and stereochemistry of which have been investigated. Methanol containing anhydrous calcium chloride converts the adducts of ring