Kinetic and Thermodynamic Control in the Synthesis of Tetrahydro-Pyrans and -Furans from 1,4-Diols by Stereospecific Phenylsulfanyl (PhS) Migration: Competition Between exo and endo Transition States and between [1,2] and [1,4]Sulfanyl Participation
Synthesis of cyclic ethers and allylic sulfides by rearrangement of phenylsulfanyl substituted 1,n-diols with toluene-p-sulfonic acid and with toluene-p-sulfonyl chloride
作者:Laurent Djakovitch、Jason Eames、David J. Fox、Francis H. Sansbury、Stuart Warren
DOI:10.1039/a905498g
日期:——
Rearrangement of a series of 1,n-diols (n = 2 to 12), with a PhS-group adjacent to one OH group, under two sets of conditions gives single compounds in excellent yield drawn for four possible classes of products. The effect of the chain length helps in the understanding of the different cyclisation modes and the mechanism of the rearrangements.
Rearrangement of a series of 1,n diols (n= 2 to 12), one OH group having an adjacent PhS group, under the two sets of conditions in the title, gives single compounds in high yield drawn from four possible classes of product. The effects of chain length help in our understanding of the mechanism of the rearrangements.
Synthesis of tetrahydropyrans by hydroxyl participation in phenylthio migration
作者:Francis H. Sansbury、Stuart Warren
DOI:10.1016/s0040-4039(00)92726-6
日期:1991.7
Acid-catalysed cyclisation of substituted 1,6- or 1,4-alkane diols with suitably placed phenylthio groups leads to high yields of tetrahydropyrans formed by exo or endo hydroxyl participation during phenylthio migration with inversion at both the migration origin and terminus.