A new radical approach to cyclic ethers 2 is offered by the intramolecular homolytic substitution (SH i) reaction at a silicon center. High diastereoselectivities can be obtained in this efficient unimolecular chain transfer reaction. Less suitable are radicals such as 1 in which an R3 Si group replaces the SnMe3 group.
通过在硅中心的分子内均质取代(S H i)反应,提供了一种新的自由基醚基自由基方法。在这种有效的单分子链转移反应中可以获得高的非对映选择性。不太合适的是自由基,例如1,其中R 3 Si基团取代了SnMe 3基团。