Kinetic Resolution and Dynamic Kinetic Resolution of γ‐Aryl‐Substituted Butenolides via Copper‐Catalyzed 1,4‐Hydroboration
作者:Soyeon Lee、Do Hyun Ryu、Jaesook Yun
DOI:10.1002/adsc.202001353
日期:2021.4.27
Kinetic resolution (KR) and dynamic kinetic resolution (DKR) of γ‐aryl and heteroaryl‐substitutedbutenolides via CuH‐catalyzed 1,4‐hydroboration using pinacolborane is reported. With a copper‐Ph‐BPE catalyst, selectivity factors were extremely high (s=>400) with regard to the kinetic resolution of β‐methyl‐γ‐phenyl butenolide; DKR was possible in the presence of an amine base (DBU), which facilitated racemization
Stereoselective preparation of highly functionalized (Z)-3-magnesiated enoates by an iodine–magnesium exchange reaction
作者:Ioannis Sapountzis、Wolfgang Dohle、Paul Knochel
DOI:10.1039/b106195j
日期:2001.10.11
3-Iodoenoates are converted into the corresponding
alkenylmagnesium species with complete retention of configuration of the
double bond; both direct reaction and copper(I)-mediated
reactions with various electrophiles provide polyfunctional enoates.
Synthesis of butenolides from α-(phenylthio)-ketones and -esters: crystal structure of an intermediate β-phenylthio-γ-lacton
作者:Peter Brownbridge、Ernst Egert、Paul G. Hunt、Olga Kennard、Stuart Warren
DOI:10.1039/p19810002751
日期:——
stereoselectively to β-phenylthio-γ-butyrolactones. Oxidation to sulphoxides and thermolysis provides a general synthesis of β- and γ-substituted Δαβ-butenolides. Treatment of 5,5-dimethyl-4-oxo-3-(phenylthio)-hexanoic acid with NaBH4 gives a single γ-lactone whose PhS and But groups are shown to be cis by an X-ray crystal structure determination.
A simple route to Δ2-butenolides from conjugated aldehydes
作者:E.J. Corey、Greg Schmidt
DOI:10.1016/s0040-4039(00)71458-4
日期:1980.1
Dynamic Kinetic Resolution of α,β-Unsaturated Lactones through Asymmetric Copper-Catalyzed Conjugate Reduction: Application to the Total Synthesis of Eupomatilone-3
作者:Matthew P. Rainka、Jacqueline E. Milne、Stephen L. Buchwald