General sulfone construction <i>via</i> sulfur dioxide surrogate control
作者:Shihao Chen、Yaping Li、Ming Wang、Xuefeng Jiang
DOI:10.1039/c9gc03841h
日期:——
sulfones with a facile combination of halides, sulfurdioxide surrogates and phosphate esters is described. When thiourea dioxide was employed as a reductive sulfurdioxide surrogate, alkyl–alkyl sulfones were obtained under transitionmetal free conditions. Aryl–alkyl sulfones were obtained with an extremely low catalytic loading (0.2 mol%) via altering the mask of sulfurdioxide surrogates to sodium
Ring closure of 2-thia- and 2-sulfonyl-5-hexenyl radicals
作者:Ernest W. Della、Sean D. Graney
DOI:10.1016/s0040-4039(00)01377-0
日期:2000.10
Reductive cyclisation of the 2-sulfonyl-5-hexenyl radical with tributyltin hydride in benzene at 80°C affords a 73:23 mixture of the sulfones derived from 5-exo- and 6-endo- ringclosure with a small quantity (4%) of reduced material; under identical conditions, the 2-thia-5-hexenyl radical gives a 70:13:17 mixture of the corresponding sulfides.