Synthesis of Arylethyl (E)-Styrylsulfones and Arylsulfones by One-Pot DIBAL-H/NaH-Mediated Reaction of β-Ketosulfones
作者:Meng-Yang Chang、Yi-Chia Chen、Chieh-Kai Chan
DOI:10.1055/s-0033-1339117
日期:——
A facile one-pot synthetic route for preparing a series of arylethyl (E)-styrylsulfones or arylethyl arylsulfones is developed. The efficient one-pot DIBAL-H/NaH-mediated route includes reduction of -benzyl--arylketosulfones and retroaldol/aldol or retroaldol reaction of the resulting intermediate. The DIBAL-H/NaH-mediated reaction mechanism has been discussed.
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.
A mild, practical method to prepare α-sulfonyl and α-trifluoromethyl ketones from readily available enol acetates and sulfonyl chlorides has been developed using visible-lightphotoredoxcatalysis. The method could be used with a wide range of enol acetates and sulfonyl chlorides, and gave the desired products in satisfactory to excellent yields.