Efficient methods of synthesis of unsaturated alcohols and ketones by allylation of Favorsky reaction products under phase transfer conditions
作者:V. A. Potapov、T. I. Yaroshenko、V. A. Panov、M. V. Musalov、A. G. Khabibulina、M. V. Musalova、S. V. Amosova
DOI:10.1134/s1070428016120034
日期:2016.12
Allylation of the Favorsky reaction products with allyl halides under phase-transfer catalysis in the system CuI–K2CO3–Na2SO3–BTEAC–H2O–C6H6 afforded the corresponding allylpropargyl alcohols in high yields (87–96%). The procedure is practical and scalable (more than 50 g of the target product can be prepared in a single run) and is characterized by high selectivity. Oxidation of secondary allylpropargyl
在相转移催化下,CuI–K 2 CO 3 –Na 2 SO 3 –BTEAC–H 2 O–C 6 H 6体系中的Favorsky反应产物与烯丙基卤的烯丙基化可提供高收率的相应的烯丙基炔丙醇(87– 96%)。该方法是实用且可扩展的(一次可制备50克以上目标产品),并且具有高选择性的特点。在室温下,用二氧化锰在无水乙腈中氧化仲烯丙基炔丙醇,可得到75-81%的烯丙基炔酮。
Electrophilic Carbocyclization of Hydroxylated Enynes
Mild, efficient, and clean! Six‐membered cyclic products including diiodocyclohexadiene and 2,3‐diiodobenzene have been prepared in a iodonium‐induced internal carbocyclization of hydroxylatedenynes (see scheme). This reaction proceeds smoothly under mild reaction conditions, and all the halogen atoms (I and Br) generated from the electrophiles are used effectively.
Pd-Catalyzed Enantioselective Syntheses of Trisubstituted Allenes via Coupling of Propargylic Benzoates with Organoboronic Acids
作者:Huanan Wang、Hongwen Luo、Zhan-Ming Zhang、Wei-Feng Zheng、Yu Yin、Hui Qian、Junliang Zhang、Shengming Ma
DOI:10.1021/jacs.0c02876
日期:2020.5.27
ligand, Ming-Phos, the first example of palladium-catalyzed highly enantioselective coupling of racemic propargylic benzoates with organoboronic acids for chiralallenessynthesis has been developed. Excellent asymmetric induction has been achieved with a decent substrate scope. Synthetic potentials for the construction of polycyclic compounds with multiple chiral centers have been demonstrated.
Gold(I) Catalyzed Isomerization of 5-en-2-yn-1-yl Acetates: An Efficient Access to Acetoxy Bicyclo[3.1.0]hexenes and 2-Cycloalken-1-ones
作者:Andrea Buzas、Fabien Gagosz
DOI:10.1021/ja064223m
日期:2006.10.1
The gold(I) catalyzed rearrangement of 5-en-2-yn-1-yl acetates into functionalized acetoxy bicyclo[3.1.0]hexenes is described. The mild reaction conditions employed allow the efficient and rapid synthesis of a variety of such bicyclic compounds via a sequence of two gold(I)-catalyzed isomerization steps. Acetoxy bicyclo[3.1.0]hexenes products can be further transformed to 2-cycloalkenones by simple methanolysis.