WUTS, PETER G. M.;PRUITT, LYNN E., SYNTHESIS,(1989) N, C. 622-623
作者:WUTS, PETER G. M.、PRUITT, LYNN E.
DOI:——
日期:——
An Efficient Synthesis of (4<i>S</i>)-(-)-4-Isopropyl-2-oxazolidinone
作者:Peter G. M. Wuts、Lynn E. Pruitt
DOI:10.1055/s-1989-27337
日期:——
A new, efficient, cost-effective method for the preparation of the Evans' chiral auxiliary (4S)-4-isopropyl-2-oxazolidinone (4) is described. A Schotten-Baumann acylation of valine with phenyl carbonochloridate quantitatively affords the protected valine, which is then reduced with borane in tetrahydrofuran to give an alcohol. Cyclization with a catalytic amount, of potassium tert-butoxide gives 4 in 81% overall yield and in 41-43% after crystallization from ethyl acetate/n-hexane.