Base-Promoted Three-Component Cascade Reaction of α-Hydroxy Ketones, Malonodinitrile, and Alcohols: Direct Access to Tetrasubstituted N<i>H</i>-Pyrroles
malonodinitrile, and alcohols has been developed, providing a direct and efficient route to a range of structurally diverse and synthetically useful 2-alkyloxy-1H-pyrrole-3-carbonitrile derivatives. The reaction involved three different bond (C–C, C–O, and C–N) formations in a single step, and its regioselectivity was depended on the structure of the α-hydroxy ketones employed. The use of easily available
Catalytic Scope of the Thiamine-Dependent Multifunctional Enzyme Cyclohexane-1,2-dione Hydrolase
作者:Sabrina Loschonsky、Simon Waltzer、Sonja Fraas、Tobias Wacker、Susana L. A. Andrade、Peter M. H. Kroneck、Michael Müller
DOI:10.1002/cbic.201300673
日期:2014.2.10
cyclohexane‐1,2‐dione hydrolase (CDH) catalyzes the asymmetric cross‐benzoin reaction of aromatic aldehydes and pyruvate (up to quantitative conversion and 92–99 % ee). Notably, CDH accepts several aldehydes, such as hydroxybenzaldehydes, nitrobenzaldehydes, and naphthaldehydes; previously, these have only in rare cases been known as substrates of other thiamine‐dependent enzymes.