A mild and highly chemoselective iodination of alcohol using polymer supported DMAP
作者:DIPARJUN DAS、JASHA MOMO H ANAL、LALTHAZUALA ROKHUM
DOI:10.1007/s12039-016-1158-1
日期:2016.11
supported DMAP is used in catalytic amount and is recovered and reused several times. Additionally, this method is highly chemoselective. A mild and highly selective iodination of alcohols using polymer supported 4-(Dimethylamino)pyridine (DMAP) in catalytic amount is reported. The basecatalyst can be easily recovered by simple filtration and reused several times without appreciable loss in activity.
Stereoselective aryl migration reactionsfromsulfur in sulfonates and sulfonamides to C-centered radicals are reported. The 1,5-aryl migration fromsulfur to differently substituted C-centered radicals could be performed with high yields and selectivities. Functionalized aryl groups could also be transferred by this new method. A model to explain the stereochemical outcome of the reaction is presented and some
diastereoselective radical 1,5 phenylmigration reactions fromsilicon in diarylsilyl ethers to various C-centered radicals to form the corresponding 3-phenylated alcohols are described. Functionalized aryl groups can also be transferred. The effect of the variation of the attacking radical on the aryl transfer reaction is discussed. Best results are obtained for the phenylmigration to nucleophilic secondary
New general synthesis of medium ring-lactones a regioselective β-scission of alkoxyl radicals generated from catacondensed lactols
作者:Hiroshi Suginome、Shinji Yamada
DOI:10.1016/s0040-4020(01)81628-8
日期:1987.1
describe a newgeneral method for the synthesis of medium-sized lactones based on ring-enlargement via a regioselective β-scission of alkoxyl radicals generated by photolysis from the hypoiodites of several catacondensed lactols. The syntheses of 9-membered lactones from 65 fused lactols, 10-membered lactones including a naturally occurring lactone, phoracantholide I, from 66 or 75 fused lactols, and
New general synthesis of medium-sized lactones: A new entry tothe synthesis of (+−)-phoracantholide I [(+−)-decan-9-olide]
作者:Hiroshi Suginome、Shinji Yamada
DOI:10.1016/s0040-4039(00)89231-x
日期:1985.1
We describe a new general method for the synthesis ofmedium-sized lactones under mild conditions involving β-scissionof alkoxy radicals derived from catacondensed lactols as a key stepand its application to an efficient newsynthesis of a naturallyoccurring 10-membered lactone, phoracantholide I[(+−)-decan-9-olide].