Enantiomere der 2,2'-dinitrobiphenyl-6,6'- dicarbonsäure als stereoselektiv wirksame, reversible schutzgruppen-II
作者:H.K. Müller、J. burgold
DOI:10.1016/s0040-4020(01)87373-7
日期:1986.1
-S-(-)-1.1'-Diphenyl-2,2'-dinilro-6,6'-dicarboxylic acid (1) is used as an axial-chiral protecting group for the primary hydroxy group of glycerol and glyocerol derivatives. Diesters of 1 were formed which have the largest distance between the nitro groups and the nucleophilic subtituents on glycerol After hydrogenolytical removal of the protecting group asymmetric glycerol derivatives were obtained
-S-(-)-1.1'-联苯-2,2'-二硝基-6,6'-二羧酸(1)用作甘油和甘油衍生物的伯羟基的轴向手性保护基。形成1的二酯,其在甘油上的硝基基团和亲核取代基之间具有最大距离。在氢解除去保护基团之后,获得不对称甘油衍生物,其对映体过量约10%。12的羟基溴化反应主要产生了抗马尔可夫尼可夫13a而不是预期的仅存在于痕迹中的马尔可夫尼可夫产物13b。