β-unsaturated β-hydroxy-carboxylic acids 2a/b. A diastereo- and enantioselective aldoltype addition of phenylacetic acid dianion to benzaldehyde has been achieved by employing optically active alkoxide amide bases. Finally, highly stereocontrolled additions to the novel β-lactone substituted ester enolates 22 are described.
据报道,利用抗构型的γ,β-不饱和β-羟基
羧酸2a / b,对于外消旋的4-表-blastmycinone(6)和δ-multistriatine(13)进行了新的立体选择性合成。通过使用旋光性醇盐酰胺碱,已将
苯乙酸二阴离子非对映体和对映体选择性的醛醇型加成到
苯甲醛中。最后,描述了对新型β-内酯取代的酯烯酸酯22的高度立体控制的加成。