期刊
TETRAHEDRON LETTERS
卷 41, 期 5, 页码 643-646出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(99)02129-2
关键词
asymmetric reactions; hydrogenation; polymer support; ruthenium
The synthesis of a monomeric analogue of BINAP, diam-BINAP, is described. The polyaddition of this monomer with 2,6-diisocyanato toluene gave the corresponding oligomer, poly-NAP, with a polymerization degree of 8. The ruthenium complex of this polymer proved to be a very efficient heterogeneous catalyst for the hydrogenation of beta-ketoesters (99% ee, 0.1 mol% of catalyst). Furthermore the catalyst could be easily reused four times by simple filtration without loss of activity or enantioselectivity. (C) 2000 Elsevier Science Ltd. All rights reserved.
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