Stereoselective Synthesis of Tricyclic Pyranoxepin Derivatives by Ruthenium-Catalyzed Enyne Metathesis/Diels-Alder Reaction
作者:K. Majumdar、H. Rahaman、S. Muhuri、B. Roy
DOI:10.1055/s-2006-926238
日期:——
Synthesis of tricyclic oxepin-annulated pyrone derivatives has been achieved by the ring-closing enyne metathesis using the first-generation Grubbs' catalyst under a nitrogen atmosphere. The Diels-Alder reaction of these cyclized products with the dienophile proceeded smoothly to afford the tricyclic compounds in excellent yield.
Tetronic acid (pKa 3.76) and triaceticacidlactone (pKa 4.94) have been alkylated at their active carbon atoms by means of thermodinamically controlled palladium catalyzed allylic alkylations.
已通过热丁二胺控制的钯催化的烯丙基烷基化作用将四氢苯甲酸(pK a 3.76)和三乙酸内酯(pK a 4.94)烷基化。
Palladium-catalyzed C-alkylations of the highly acidic and enolic triacetic acid lactone. Mechanism and stereochemistry