Grignard Reactions of 4-Substituted-2-keto-1,3-dioxanes: Highly Diastereoselective Additions Controlled by a Remote Alkyl Group
作者:William F. Bailey、David P. Reed、Daniel R. Clark、Gabriel N. Kapur
DOI:10.1021/ol015914k
日期:2001.6.1
[see reaction]. The reactions of Grignard reagents with a representative series of simple cis-2-keto-4-substituted-1,3-dioxanes have been investigated. The stereochemical outcome of these highly diastereoselective additions (dr > 90:10) is consonant with Cram's chelate model on the assumption that RMgX coordinates preferentially with the ring oxygen remote from the C(4) substituent.
[请参阅反应]。研究了格氏试剂与代表性的一系列简单的顺式-2-酮-4-取代的1,3-二恶烷的反应。这些高度非对映选择性添加物(dr> 90:10)的立体化学结果与Cram螯合物模型一致,其前提是RMgX优先与远离C(4)取代基的环氧协调。