Efficient sulfonylation of ketones with sodium sulfinates for the synthesis of β-keto sulfones
作者:Siqi Deng、En Liang、Yinrong Wu、Xiaodong Tang
DOI:10.1016/j.tetlet.2018.09.049
日期:2018.10
The oxidative sulfonylation of ketones with sodium sulfinates as the sulfone source and DMSO as the oxidant is reported. A series of β-keto sulfones were obtained in good to excellent yields. The advantages of this efficient protocol include the low cost of DMSO and HBr, and a broad scope.
Ring expansion reaction of α-sulfonyl cyclic ketones via insertion of arynes into C–C: a facile and mild access to medium- and large-sized benzannulated carbocycles
作者:Tiexin Zhang、Xian Huang、Jian Xue、Sha Sun
DOI:10.1016/j.tetlet.2009.01.001
日期:2009.3
Insertion of arynes into C–C of α-sulfonyl ketones was investigated, which lead to the ring expansion reactions when α-sulfonyl cyclic ketones were used. By ring expansions and desulfonylations, medium- and large-sized benzannulated cyclic ketones were obtained in moderate yields.
Synthesis of Substituted Benzenes via Bi(OTf)<sub>3</sub>-Mediated Intramolecular Carbonyl Allylation of α-Prenyl or α-Geranyl β-Arylketosulfones
作者:Meng-Yang Chang、Yu-Chieh Cheng、Yi-Ju Lu
DOI:10.1021/acs.orglett.5b01461
日期:2015.6.19
Intramolecular carbonyl allylation of alpha-prenyl or alpha-geranyl beta-arylketosulfones 5 in the presence of molecule sieves (MS) affords substituted benzenes 6-7 in moderate to good yields. The facile transformation proceeds by a synthetic sequence starting with the alpha-prenylation or alpha-geranylation of 1 and the Bi(OTf)(3)-mediated annulation of 5 followed by a sequential desulfonative aromatization or then an intramolecular FriedelCrafts alkylation. A plausible mechanism has been studied and proposed.
Sodium amalgam mediated desulfonylative reduction of α-functionalized β-ketosulfones
作者:Chieh-Kai Chan、Yi-Hsuan Huang、Meng-Yang Chang
DOI:10.1016/j.tet.2016.07.043
日期:2016.9
Sodiumamalgam mediated desulfonylative reduction of β-ketosulfones in MeOH at rt affords alcohols in good yields via radical desulfonylation of β-ketosulfones and sequential Bouveault-Blanc reduction of the resulting ketones.