A novel silica catalysed stereoselective cyclic carbamate and carbonate rearrangement
作者:Lorenzo Caggiano、John Davies、David J. Fox、David C. Moody、Stuart Warren
DOI:10.1039/b303791f
日期:——
Phenylsulfanyl-containing five- and six-membered lactones, cyclic carbamates and carbonates stereospecifically interconvert in the presence of silica gel via thiiranium ions.
含苯硫烷基的五元和六元内酯、环状氨基甲酸酯和碳酸酯在硅胶存在下通过硫鎓离子进行立体定向互变。
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.