Thia-Michael Addition Reactions Using 2-[Bis(alkylthio)methylene]-3-oxo-<i>N</i>-<i>o</i>-tolylbutanamides as Odorless and Efficient Thiol Equivalents
作者:Dewen Dong、Qun Liu、Haifeng Yu、Yan Ouyang、Xihe Bi、Yumei Lu
DOI:10.1055/s-2005-923602
日期:——
A series of 2-[bis(alkylthio)methylene]-3-oxo-N-o-tolylbutanamides 1 have been investigated as nonthiolic and odorlessthiolequivalents in thia-Michael addition reactions. The cleavage of compounds 1 is initiated by NaOHin EtOH; the in situ generated thiolate anions undergo facile conjugate addition to α,β-unsaturated carbonyl compounds 2 affording the corresponding β-keto sulfides 3 in very high
A Bifunctional Cinchona Alkaloid-Squaramide Catalyst for the Highly Enantioselective Conjugate Addition of Thiols to trans-Chalcones
作者:Le Dai、Su-Xi Wang、Fen-Er Chen
DOI:10.1002/adsc.201000334
日期:2010.9.10
A chiral squaramide catalysts‐promoted asymmetric sulfa‐Michael conjugated addition of thiols to trans‐chalcones is presented. Moderate to excellent yields and high enantioselectivities (up to 99% ee) were achieved under mild conditions.
One-pot efficient synthesis of β-aryl-β-sulfanyl ketones via a four-component reaction of alkyl halides, thiourea benzaldehydes and acetophenones
作者:Mohammad Abbasi、Najmeh Nowrouzi、Saadat Mousavi
DOI:10.1016/j.tetlet.2019.151531
日期:2020.2
A one-potefficientsynthesis of β-aryl-β-sulfanyl ketones is introduced via a tandem aldol condensation-thia-Michael addition process using NaOH in the poly ethylene glycol (PEG-200). Addition of different thiols in situ generated from the reaction of alkyl halides with thiourea to chalcones, formed in situ from the condensation of acetophenone derivatives with benzaldehydes, led to a high yielding