Experimental and Computation Studies on<i>Candida antarctica</i>Lipase B-Catalyzed Enantioselective Alcoholysis of 4-Bromomethyl-β-lactone Leading to Enantiopure 4-Bromo-3-hydroxybutanoate
作者:Jung Yun Lim、Nan Young Jeon、A-Reum Park、Bora Min、Bum Tae Kim、Seongsoon Park、Hyuk Lee
DOI:10.1002/adsc.201200901
日期:2013.6.17
including statins, were synthesized from rac‐4‐bromomethyl‐β‐lactone through kinetic resolution. Candida antarctica lipase B (CAL‐B) enantioselectively catalyzes the ring opening of the β‐lactone with ethanol to yield ethyl (R)‐4‐bromo‐3‐hydroxybutanoate with high enantioselectivity (E>200). The unreacted (S)‐4‐bromomethyl‐β‐lactone was converted to ethyl (S)‐4‐bromo‐3‐hydroxybutanoate (>99% ee), which can
Synthesis of chlorinated β- and γ-lactones from unsaturated acids with sodium hypochlorite and Lewis acids
作者:José A. López-López、Francisco M. Guerra、F. Javier Moreno-Dorado、Zacarías D. Jorge、Guillermo M. Massanet
DOI:10.1016/j.tetlet.2007.01.043
日期:2007.3
The direct synthesis of several β- and γ-lactones used as electrophilic sources of chlorine, sodium hypochlorite and a Lewis acid is described. The scope and limitations of the method are discussed.
Practical β-Lactone Synthesis: Epoxide Carbonylation at 1 atm
作者:John W. Kramer、Emil B. Lobkovsky、Geoffrey W. Coates
DOI:10.1021/ol061292x
日期:2006.8.1
text] A readily prepared bimetallic catalyst is capable of effecting epoxide carbonylation to produce beta-lactones at substantially lower CO pressures than previously reported catalyst systems. A functionally diverse array of beta-lactones is produced in excellent yields at CO pressures as low as 1 atm. This procedure allows for epoxide carbonylation on a multigram scale without the requirement of specialized
Synthesis of β-Lactones by the Regioselective, Cobalt and Lewis Acid Catalyzed Carbonylation of Simple and Functionalized Epoxides
作者:Jong Tae Lee、P. J. Thomas、Howard Alper
DOI:10.1021/jo010295e
日期:2001.8.1
The PPNCo(CO)(4) and BF(3) x Et(2)O catalyzed carbonylation of simple and functionalized epoxides in DME gives the corresponding beta-lactones regioselectively in good to high yields. The carbonylation occurred selectively at the unsubstituted C-O bond of the epoxide ring, and this reaction tolerates various functional groups such as alkenyl, halide, hydroxy, and alkyl ether.
An aluminum(<scp>iii</scp>) picket fence phthalocyanine-based heterogeneous catalyst for ring-expansion carbonylation of epoxides
作者:Jianwei Jiang、Sungho Yoon
DOI:10.1039/c8ta11877a
日期:——
heterogeneous catalyst for ring-expansion carbonylation of epoxides may have additional advantages over the homogeneous counterpart in terms of facile product separation and recyclability. A new Al(III) picket fence phthalocyanine complex was synthesized and directly knitted using the Friedel–Crafts reaction to prepare a solid porous network, which was ultimately used to immobilize [Co(CO)4]− ions. The