The stereochemistry of the Grignard — Ortho ester reaction revisited: Regioselective endocyclic cleavage in the reaction of Grignard reagents with cis-2-methoxy-4-methyl-1,3-dioxane
作者:William F. Bailey、Allan A. Croteau、Alberto D. Rivera
DOI:10.1016/s0040-4039(97)00862-9
日期:1997.6
The reaction of cis-2-methoxy-4-methyl-1,3-dioxane (4) with Grignard reagents proceeds in a totally regioselective manner via rupture of the less congested C(2)O(1) bond remote from the 4-methyl substituent. The analogous r-2-methoxy-cis-4,cis-6-dimethyl-1,3-dioxane (2) is totally inert to the action of Grignard reagents.
的反应顺-2-甲氧基-4-甲基-1,3-二恶烷(4与格氏试剂进行以完全区域选择性方式经由较不拥塞的C(2)O(1)键的破裂远离4) -甲基取代基。类似的r -2-甲氧基-顺式-4,顺式-6-二甲基-1,3-二恶烷(2)对格氏试剂完全是惰性的。