Utilizing two robust C–C bond-forming reactions, the Baylis–Hillman reaction and the Diels–Alder reaction, we report a highly enantio-, regio-, and diastereoselectivesynthesis of hexahydro-2H-chromenes via two sequential [4 + 2] cycloadditions. These tandem and formal cycloadditions have also been performed as a “one-pot” sequence to access the corresponding heterocycles constituting up to five contiguous
Regioselective mono-aza-Michael additions of divinyl ketones with 3-(arylimino)indolin-2-ones: Synthesis of N-enone-functionalized 3-(arylimino)indolin-2-ones
作者:Xiao Chen、Zheng Li
DOI:10.1177/1747519820920179
日期:2020.11
Selective mono-aza-Michael additions of divinyl ketones with 3-(arylimino)indolin-2-ones in the presence of cesium carbonate are described. N-Enone-functionalized 3-(arylimino)indolin-2-ones were efficiently synthesized in satisfactory yield. The salient features of this protocol are high regioselectivity, high yield, and mild conditions.
Eco-Friendly Mono-1,4-Hydrocyanation of Diarenyl Ketones Using Potassium Hexacyanoferrate(II) as a Cyanide Source
作者:Xiao-Ning Hu、Chen-Hui Liu、Zheng Li
DOI:10.3184/174751915x14197812950625
日期:2015.1
A selective mono-1,4-hydrocyanation of 10 diarenyl ketones usingpotassiumhexacyanoferrate(II) as an eco-friendlycyanidesource, potassium hydroxide as a catalyst, and benzoyl chloride as a promoter has been achieved. This protocol has the advantages of a non-toxic cyanidesource, a heavy metal-free catalyst, selectivity, very good yields and a simple work-up procedure.
Diastereoselective Synthesis of 2,6-Diaryltetrahydrothiopyran-4-ones by Phase-Transfer Catalysis
作者:Thibault Gendron、Hripsimée Kessedjian、Elisabeth Davioud-Charvet、Don Antoine Lanfranchi
DOI:10.1002/ejoc.201403516
日期:2015.3
Two efficient phase-transfer-catalyzed protocols for the diastereoselective synthesis of cis and trans isomers of 2,6-diaryltetrahydrothiopyran-4-ones (2,6-DATHTPs) have been developed. In a study of the scope of the reactions, differently substituted 2,6-DATHTPs were successfully accessed in high yields and diastereomeric excessses on both experimental and preparative scales.
Novel Dipolar CycloadditionReactions of Zwitterionic Species Generated from Dimethoxycarbeneand Dimethyl Acetylenedicarboxylate with Carbonyl Compounds: FacileSynthesis of Dihydrofuran Derivatives
The reaction of 1:1 zwitterionic species, generated in situ by the addition of dimethoxycarbene to dimethyl acetylenedicarboxylate, towards carbonyl compounds is described. The reactions presented offer a one-pot synthesis of dihydrofuran and spiro dihydrofuran derivatives in high yields.