A practical procedure for the synthesis of multifunctional aldehydes through the Fukuyama reduction and elucidation of the reaction site and mechanism
作者:Mayumi Kimura、Masahiko Seki
DOI:10.1016/j.tetlet.2004.02.130
日期:2004.4
A highly efficient heterogeneous Pd/C catalyst D1 was found to effect the reduction of thiol esters 1 to the corresponding aldehydes 2 with such a low catalyst loading as 0.5-10 mol%. The chemical properties of the Pd/C catalysts together with the XRF analysis reveal that the reduction is most likely to proceed on the solid surface of the Pd/C catalyst rather than in the solution phase outside the pores. A reaction mechanism through oxidative addition of Pd to the thiol esters I was postulated by detection of the oxidative addition intermediate by React IR analysis. A practical purification of 2 was accomplished by conversion to water-soluble bisulfite adducts 7. (C) 2004 Elsevier Ltd. All rights reserved.
A Facile Synthesis of a Key Intermediate for (+)-Biotin via Strecker Reaction
作者:Masahiko Seki、Yoshikazu Mori、Mayumi Kimura
DOI:10.1055/s-2003-42399
日期:——
(syn-anti, 2:1). Amidation of 5b and subsequent cyclization gave bicyclic compound 6, which, upon reduction with zinc dust, hydrolysis and subsequent cyclization, furnished thiolactone 2, a key intermediate for (+)-biotin (1).