Sigmatropic Reactions in Carbanions. I. The 5, 6-dihydro-2H-pyran-2-ide cyclopropyl-enolate rearrangement
作者:V. Rautenstrauch
DOI:10.1002/hlca.19720550232
日期:1972.1.31
of 5,6-dihydro-2H-pyran (7) gives a mixture of dihydropyranyllithiums 14 and 2. 14 rearranges to 2, and 2 in turn undergoes a [1,4] sigmatropic shift to give the lithium cyclopropyl-enolate 3. Lithiation of nerol oxide 6 gives the lithio derivative 24, which likewise undergoes [1,4] shifts to give cyclopropyl-enolates 28 and 29.
5,6-二氢-2 H-吡喃的锂化(7)得到二氢吡喃基锂14和2的混合物。14重新排列为2,然后2依次发生[1,4]σ位移,得到环丙基-烯酸锂3。氧化神经醇6的锂化得到锂硫基衍生物24,其同样经历[1,4]转变以产生环丙基-烯醇盐28和29。