prepared by condensation of β-aminoalcohols 2 with ethyl (2-oxocyclopentyl)acetate 1 and subsequent reduction of intermediates 3. Compound 4a was converted to 6 via 5. With compounds 4, 5 or 6 as chiral ligands in the reaction of benzaldehyde with diethylzinc an enantiomeric excess between 14 and 84% was achieved.
通过将β-
氨基醇2与(2-氧代环戊基)
乙酸乙酯1缩合,然后还原中间体3来制备对映体纯化合物4。化合物4a经5转化为6。用化合物4,5或6,如
苯甲醛的反应手性
配体与
二乙基锌的对映体过量14之间和84%达到了。