Transition-Metal-Free Synthesis of 2-Substituted Methyl Benzo[b]furan-3-carboxylates
摘要:
A concise and highly efficient synthetic pathway was developed for 2-substituted methyl benzo[b]furan-3-carboxylates. This method provides convenient and cost-effective access for 2-substituted methyl benzo[b]furan-3-carboxylates without the use of a transition metal catalyst for synthesis. Furthermore, in most cases, this method gives excellent yields and conventional flash column chromatography is not needed for purification.
Dual Rh(
<scp>II</scp>
)/Pd(0) Relay Catalysis for
<scp>One‐Pot</scp>
Synthesis of
<scp>α‐Quaternary</scp>
Allylated Indolin‐2‐ones and Benzofuran‐2‐ones
作者:Yu Lim Lee、Kyu Ree Lee、Zi Xuan、Sang‐gi Lee
DOI:10.1002/bkcs.12211
日期:2021.3
Cooperative Rh(II) and Pd(0) dual relay catalysis has been developed, which allowed one‐potsynthesis of α‐quaternary allylated indolin‐2‐ones and benzofuran‐2‐ones. The catalytic reaction proceeded through the sequential Rh(II)‐catalyzed intramolecular aromatic C(sp2)‐H bond functionalization of α‐diazo carbonyl compounds, followed by Pd(0)‐catalyzed allylic alkylation with allylic carbonates to afford
A novel asymmetric organocatalytic Michael–aldol–dehydration domino reaction for the construction of spirocyclic benzofuranones
作者:Liang-Wen Qi、Liang-Liang Wang、Lin Peng、Li-Na Jia、Fang Tian、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1016/j.tet.2013.08.030
日期:2013.11
Organocatalytic Michael–aldol–dehydration domino reaction of 3-(1-hydroxyethylidene)benzofuran-2(3H)-ones and enones catalyzed by Cinchona-based primary amine has been developed. The desired chiral spirocyclicbenzofuranones were obtained in excellent stereoselectivities (dr>20:1 and up to 96% ee) and moderate to excellent yields (up to 98%).
3-(1-羟基)的有机催化迈克尔羟醛脱水多米诺反应苯并呋喃-2(3 H ^) -酮,并通过基于金鸡纳伯胺催化的烯酮已经研制成功。在立体选择性优良,得到所需的手性螺环苯并呋喃酮(DR> 20:1和高达96%ee)和中等至良好的产率(高达98%)。