Metal-Dependent Reaction Tuning with Cyclopentylmetal Reagents: Application to the Asymmetric Synthesis of (+)-α-Conhydrine and (<i>S</i>)-2-Cyclopentyl-2-phenylglycolic Acid
作者:Siddharth Roy、Anubha Sharma、Soumyaditya Mula、Subrata Chattopadhyay
DOI:10.1002/chem.200801603
日期:2009.2.2
The reaction of halocyclopentane organometallic reagents can be tuned by the choice of metal (see scheme). Cyclopentylmagnesium bromide reduces aldehydes and ketones to the corresponding alcohols. However, in the presence of ZnCl2, normal Grignard addition to the ketones gives tertiary alcohols with complete diastereoselectivity. These protocols were used in the asymmetric synthesis of two medicinally
调整:卤环戊烷有机金属试剂的反应可通过选择金属来调整(参见方案)。环戊基溴化镁将醛和酮还原为相应的醇。然而,在存在ZnCl 2的情况下,向酮中常规的格利雅(Grignard)加成会产生具有完全非对映选择性的叔醇。这些规程用于两种医学上重要的化合物的不对称合成。