The factors controlling the cyclisation of 1,4-diols with PhS migration to give THPs rather than THFs are reassessed. Furthermore we provide evidence for a competition between [1,2] and [1,4] sulfanyl participation and cyclisation onto a five membered cyclic sulfonium salt.
控制1,4
-二醇环化形成THP而非THF的因素进行了重新评估。此外,我们提供了关于[1,2]和[1,4]
硫烷参与与环化之间竞争的证据,这一过程涉及到一个五元环状磺基盐。