Iron-Catalyzed Azidoalkylthiation of Alkenes with Trimethylsilyl Azide and 1-(Alkylthio)pyrrolidine-2,5-diones
作者:Jipan Yu、Min Jiang、Zhixuan Song、Tiancheng He、Haijun Yang、Hua Fu
DOI:10.1002/adsc.201600133
日期:2016.9.1
has been developed at room temperature, and the corresponding products containing ortho‐sited sulfide and azide units were obtained in moderate to good yields with good tolerance of functional groups. The protocol uses readily available 1‐(alkylthio)pyrrolidine‐2,5‐diones and trimethylsilylazide as the alkylthiation and azidation reagents, respectively, inexpensive and environmentally friendly iron
Regioselective Carbonylation of 2,2-Disubstituted Epoxides: An Alternative Route to Ketone-Based Aldol Products
作者:Aran K. Hubbell、Anne M. LaPointe、Jessica R. Lamb、Geoffrey W. Coates
DOI:10.1021/jacs.8b12286
日期:2019.2.13
report the regioselective carbonylation of 2,2-disubstituted epoxides to β,β-disubstituted β-lactones. Mechanistic studies revealed epoxide ring-opening as the turnover limiting step, an insight that facilitated the development of improved reaction conditions using weakly donating, ethereal solvents. A wide range of epoxides can be carbonylated to β-lactones, which are subsequently ring-opened to produce
herein is the first 1,3-difunctionalization of alkenes via photocatalysis. A single cobaloxime is used to carry out twocatalytic cycles in which cobaloxime is used not only as a photocatalyst to initiate the reaction but also as a metal catalyst for the β-H elimination process. Electron-deficient alkenes, electron-richalkenes, and unactivated alkenes could be directly converted to 1,3-bisphosphorylated
An efficient diastereoselective glyoxylate-ene reaction using N-glyoxyloyl camphorpyrazolidinone as an enophile
作者:Jia-Fu Pan、Uppala Venkatesham、Kwunmin Chen
DOI:10.1016/j.tetlet.2004.10.121
日期:2004.12
The diastereoselective glyoxylate-ene reaction of N-glyoxyloyl camphorpyrazolidinone (1) with various alkenes 2a-g in the presence of Lewis acid is described. The corresponding alpha-hydroxyl carbonyls were generally obtained in moderate to high chemical yields (64-87%) and with high levels of diastereoselectivities (up to 94% de). The predominance of products with the S absolute configuration at the newly formed stereogenic center was established by single crystal X-ray analysis and the importance of stereochemical induction is discussed. (C) 2004 Published by Elsevier Ltd.