.ALPHA.-Chlorinative homologation of .ALPHA.,.BETA.-unsaturated esters.
作者:EIICHI YOSHII、TORU KOIZUMI、TOSHIJI KAWAZOE
DOI:10.1248/cpb.24.1957
日期:——
Ketene triethylsilyl methyl acetals obtained by hydrosilation of α, β-unsaturated esters were reacted with phenyl (bromdichloromethyl) mercury to give homologated 2-chloroacrylates
A Substrate-Driven Approach to Determine Reactivities of α,β-Unsaturated Carboxylic Esters Towards Asymmetric Bioreduction
作者:Gábor Tasnádi、Christoph K. Winkler、Dorina Clay、Nargis Sultana、Walter M. F. Fabian、Mélanie Hall、Klaus Ditrich、Kurt Faber
DOI:10.1002/chem.201200990
日期:2012.8.13
The degree of CC bond activation in the asymmetricbioreduction of α,β‐unsaturated carboxylicesters by ene‐reductases was studied, and general recommendations to render these “borderline‐substrates” more reactivetowards enzymatic reduction are proposed. The concept of “supported substrate activation” was developed. In general, an additional α‐halogenated substituent proved to be beneficial for enzymatic