Synthesis of Enantioenriched Tertiary Benzylic Alcohols via Stereospecific Lithiation of Secondary Benzyl Carbamates - Design of Dialkylcarbamates, Cleavable under Basic, Mild Conditions
作者:Christoph Derwing、Dieter Hoppe
DOI:10.1055/s-1996-4163
日期:1996.1
Enantiomerically enriched, secondary benzyl N-[2-(tert-butyldiphenylsilyloxy)ethyl]-N-isopropylcarbamates were prepared, lithiated, and stereospecifically substituted by several electrophiles. Deprotection under basic conditions furnished optically active tertiary benzylic alcohols and glycols or 2-hydroxy-2-arylalkanoic acid esters. In summary, the sequence achieves the stereospecific chain elongation of d1-synthons, derived from secondary benzyl alcohols.
制备了对映体丰富的仲苄基 N-[2-(叔丁基二苯基硅氧基)乙基]-N-异丙基氨基甲酸酯,经石蜡化后,用几种亲电体进行立体取代。在碱性条件下进行脱保护,可得到具有光学活性的叔苄醇和乙二醇或 2-羟基-2-芳基烷酸酯。总之,该序列实现了由仲苄醇衍生的 d1-合成噻吨的立体特异性链延长。