A Metal-Free Synthesis of 2-Alkyl(or Aryl) Thiomethyl-2-cyclohexenones from Cyclic<i>Morita</i>-<i>Baylis</i>-<i>Hillman</i>Bromides
作者:Narjes Baioui、Ahlem Abidi、Farhat Rezgui
DOI:10.1002/hlca.201600136
日期:2016.9
catalyst or an expensive additive is described herein. Treatment of the MBH bromides with various thiols or ethane‐1,2‐dithiol in the presence of Et3N regioselectively affords the corresponding 2‐alkyl(or aryl) thiomethyl‐2‐cyclohexenones or the perhydro benzo[1,4]dithiepinone, respectively, in moderate to good yields (40 – 73%). The reaction is rapid and carried out in THF at room temperature.
Reactions of 2-phenylthio-2-cycloalkenones and 2-[phenyl(thiomethyl)]-2-cycloalkenones: Synthesis of some useful chiral and achiral intermediates
作者:Yashwant D. Vankar、G. Kumaravel、Indrani Bhattacharya、Padma S. Vankar、Kamaljit Kaur
DOI:10.1016/0040-4020(95)00168-8
日期:1995.4
diethyl malonate have been found to take place with the allyl acetates having a vinyl sulfide moiety whereas 2-phenylthio-2-cyclopentenone and 2-[phenylthio(methyl)]-2-cyclohexenone are transformed into some highly functionalised sulfur containing intermediates.
Cyclic α-(nitroalkyl)enones and α-(phenylsulfonylalkyl)enones undergo regioselective substitution of the nitrogroup by relatively soft sulfur, nitrogen and carbon nucleophiles.
An efficient and mild S-allylation of thiols with cyclic Baylis-Hillman acetates with no need of a transition-metal-catalyst or an expensive additive is described. Allyl sulfides are prepared in good to excellent yields (60-97%) and a single regioisomer was observed in all cases.[GRAPHICS].