A Convenient Synthesis of 3-Arylbutanolides and 3-Arylbutenolides
摘要:
A series of 3-aryl-substituted butenolides and butanolides has been prepared in a common short synthetic sequence from the corresponding aryl aldehydes. The 3-arylbutanolides are prepared by cyclisation of 3-aryl-3-cyano-1-propanols, obtained by selective reduction of 3-aryl-3-cyanopropionate esters, and are converted to 3-arylbutenolides by a sulfoxide or selenoxide elimination reaction.
Combined oxidative and reductive carbonylation of terminal alkynes with palladium iodide-thiourea catalysts
作者:Bartolo Gabriele、Giuseppe Salerno、Mirco Costa、Gian Paolo Chiusoli
DOI:10.1016/0022-328x(95)05539-2
日期:1995.11
Oxidative carbonylation of alkynes can be carried out catalytically in the absence of added oxidants if it is coupled with a reductive carbonylation process at the expense of the same alkyne invilved in the oxidative process. Maleic esters (from oxidative carbonylation) and unsaturated lactones (from reductive carbonylation) are the main products formed under the catalytic action of palladiumiodide complexes
Cyclohydrocarbonylation of substituted alkynes and tandem cyclohydrocarbonylation–CO insertion of α-keto alkynes catalyzed by immobilized Co–Rh heterobimetallic nanoparticles
作者:Kang Hyun Park、So Yeon Kim、Young Keun Chung
DOI:10.1039/b416657d
日期:——
The use of cobaltârhodium (Co2Rh2) heterobimetallic nanoparticles in the cyclohydrocarbonylation of substituted alkynes and tandem cyclohydrocarbonylationâCO insertion of α-keto alkynes to give 2(3H)- or 2(5H)-furanones is described.
PHYTOSANITARY COMPOSITIONS COMPRISING AN ETHER-AMIDE COMPOUND
申请人:RHODIA OPERATIONS
公开号:US20150208645A1
公开(公告)日:2015-07-30
The object of the present invention is phytosanitary compositions comprising an active phytosanitary product and an ether-amide compound. The ether-amide compound may natively be present as a solvent, co-solvent, crystallization inhibitor or an agent for increasing bioactivity of the active phytosanitary product.
Diastereoselective Trapping of Transient Carboxylic Oxonium Ylides with α,β‐Unsaturated 2‐Acyl Imidazoles
作者:Mengchu Zhang、Tianyuan Zhang、Dan Zhang、Wenhao Hu
DOI:10.1002/adsc.202000701
日期:2020.11.4
By developing a diastereoselective reaction of cyclopropene carboxylic acids with α,β‐unsaturated 2‐acylimidazoles, we reported here a Michael‐type trapping of transient carboxylic oxonium ylides. This transformation provides a direct approach for the construction of valuable γ‐butenolide derivatives in good yields (60–99%) with high diastereoselectivities (up to >95:5 dr) under mild reaction conditions