3-allenoic acids with AgSCF3 in the presence of (NH4)2S2O8 and catalytic copper salt was investigated. A series of 4-aryl-2,3-allenoic acids underwent radical trifluoromethylthiolation/intramolecular cyclization to afford β-trifluoromethylthiolated butenolides, which were conveniently transformed into trifluoromethylthiolated furan derivatives. In contrast, 2-monosubstituted 2,3-allenoic acids were converted
研究了在(NH 4)2 S 2 O 8和催化铜盐存在下,AgSCF 3对2,3-烯丙基酸的氧化三氟甲基硫醇化反应。一系列的4-芳基-2,3-烯丙酸经过自由基三氟甲基硫醇化/分子内环化反应,得到β-三氟甲基硫醇化的丁烯化物,将其方便地转化为三氟甲基硫醇化的呋喃衍生物。相反,在相似的反应条件下,将2-单取代的2,3-烯丙酸转化成相应的3,4-双(三氟甲硫基)丁-2-烯酸。
The Renaissance of an Old Problem: Highly Regioselective Carboxylation of 2-Alkynyl Bromides with Carbon Dioxide
作者:Bukeyan Miao、Gen Li、Shengming Ma
DOI:10.1002/chem.201503494
日期:2015.11.23
A steric effect‐controlled, zinc‐mediated carboxylation of different 2‐alkynyl bromides under an atmosphericpressure of CO2 has been developed by careful tuning of different reaction parameters, including the metal, solvent, temperature, and additive. 2‐Substituted 2,3‐allenoic acids were afforded from primary 2‐alkynyl bromides, whereas the carboxylation of secondary 2‐alkynyl bromides yielded 3‐alkynoic
Palladium-Catalyzed Dehydrogenative Carbonylative Esterification of Allenoic Acids for the Synthesis of γ-Butyrolactone Derivatives
作者:Bolin Wang、Mingzhe Ren、Nasir Iqbal、Xin Mu、Jan-E. Bäckvall、Bin Yang
DOI:10.1021/acs.orglett.4c00572
日期:2024.3.29
A highly efficient dehydrogenative carbonylative esterification of allenoic acids using Pd-catalysis was developed, providing a novel approach to synthesizing esterified γ-butyrolactone derivatives with consistently good to excellent results demonstrated across over 50 examples. Additionally, we used a heterogeneous catalyst known as Pd-AmP-MCF and harnessed biomimetic-aerobic-oxidation conditions