CHIRAL LITHIUM-1-OXYALKANIDES BY ASYMMETRIC DEPROTONATION - ENANTIOSELECTIVE SYNTHESIS OF 2-HYDROXYALKANOIC ACIDS AND SECONDARY ALKANOLS
CHIRAL LITHIUM-1-OXYALKANIDES BY ASYMMETRIC DEPROTONATION - ENANTIOSELECTIVE SYNTHESIS OF 2-HYDROXYALKANOIC ACIDS AND SECONDARY ALKANOLS
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DOI:
10.1002/anie.199014221
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发表时间:
1990-12-01
期刊:
影响因子:
--
通讯作者:
TEBBEN, P
中科院分区:
文献类型:
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作者:
HOPPE, D;HINTZE, F;TEBBEN, P
A very simple general, solution to the problem of preparing chiral synthons of the type 3 is provided by the lithium complexes 1. They are generated by asymmetric deprotonation of the corresponding prochiral ''non-activated'' alkyl carbamates with sec-butyllithium (-)-sparteine. 1 can be substituted by electrophiles stereospecifically to give the protected hydroxy-derivatives 2 (> 95 ee), and the Cbx group is readily cleavable. R1 = alkyl, Cbx = carbamoyl residue of 1.