A highly efficient method for one-carbon ring expansion. Preparation of 1-alkoxy-2-methylenecycloalkanes
作者:Tetsuya Katoh、Keiji Tanino、Isao Kuwajima
DOI:10.1016/s0040-4039(00)82052-3
日期:——
ZnBr2 induces a facile one-carbonringexpansion of 1-(TMS-methyl)-cycloalkanecarbacetals to yield the corresponding 1-alkoxy-2-methylenecycloalkanes, whereas a similar transformation can be performed efficiently from the parent aldehydes under the influence of TMS-OTf (1 mol%) and TMS-OMe (2 equiv).