Preparative scale application of Mucor circinelloides ene–reductase and alcohol dehydrogenase activity for the asymmetric bioreduction of α,β-unsaturated γ-ketophosphonates
research we applied this promising microorganism to the biotransformation of a series of α,β-unsaturated γ-ketophosphonates. The biotransformations were conducted using cheap corn steep liquor or minimal media. The products were obtained with excellent enantiomeric purity (>99% ee in most cases) and in good isolated yields, highlighting the great potential of this microorganism for asymmetric synthesis. Moreover
Asymmetric Bioreduction of β-Activated Vinylphosphonate Derivatives Using Ene-Reductases
作者:Ignacy Janicki、Piotr Kiełbasiński、Nikolaus G. Turrini、Kurt Faber、Mélanie Hall
DOI:10.1002/adsc.201700716
日期:2017.12.11
thereby providing a stereo‐complementary approach to current asymmetric hydrogenation protocols on similar compounds. Preparative‐scale syntheses performed in aqueous buffer using formate/formate dehydrogenase for recycling of the nicotinamide cofactor granted access to β‐keto‐, cyano‐ and ester phosphonates from the (E)‐isomers of α,β‐unsaturated phosphonates in up to 72% isolated yield and >99% ee.
Zinc-Mediated Chain Extension of β-Keto Phosphonates
作者:Christopher A. Verbicky、Charles K. Zercher
DOI:10.1021/jo000343f
日期:2000.9.1
A variety of beta-keto phosphonates can be converted to gamma-keto phosphonates through reaction with ethyl(iodomethyl)zinc. The presence of alpha-alkyl substituents, Lewis basic functionality, and modestly acidic NH-protons are accommodated in substrates of this reaction. Chain extension of beta-keto phosphonates that contained olefinic functionality proceeded more quickly than cyclopropanation; however, it was not possible to effect the chain extension to the exclusion of cyclopropane formation. A primary reason for this imperfect chemoselectivity appears to be the slow chain extension of beta-keto phosphonates. Nevertheless, the simplicity, the scope, and efficiency of this method serve to make it an attractive alternative to the established methods for gamma-keto phosphonate formation.
Issleib, K.; Doepfer, K.-P.; Balszuweit, A., Phosphorus and Sulfur and the Related Elements, 1982, vol. 14, p. 171 - 178