Toward the Development of a General Chiral Auxiliary. 9. Highly Diastereoselective Alkylations and Acylations to Form Tertiary and Quaternary Centers
摘要:
[GRAPHICS]Enolates of a new camphor-derived lactam auxiliary are shown to monoalkylate with very high diastereoselectivity. A second alkylation occurs with reactive alkylating agents to afford quaternary centers also with high diastereoselectivity, In accord with a proposed model for diastereoselection, lithium and sodium enolates provide products with an opposite sense of asymmetric induction.
Toward the Development of a General Chiral Auxiliary. 9. Highly Diastereoselective Alkylations and Acylations to Form Tertiary and Quaternary Centers
作者:Robert K. Boeckman,、Debra J. Boehmler、Rhonda A. Musselman
DOI:10.1021/ol016738i
日期:2001.11.1
[GRAPHICS]Enolates of a new camphor-derived lactam auxiliary are shown to monoalkylate with very high diastereoselectivity. A second alkylation occurs with reactive alkylating agents to afford quaternary centers also with high diastereoselectivity, In accord with a proposed model for diastereoselection, lithium and sodium enolates provide products with an opposite sense of asymmetric induction.
The chemistry of fungi. Part LXVIII. Absolute configuration of 2-iso-propyl-2-methyl-succinic and -glutaric acids: some resultant stereo-chemical corrections
作者:M. R. Cox、H. P. Koch、W. B. Whalley
DOI:10.1039/p19730000174
日期:——
(+)-2-Isopropyl-2-methylglutaric acid has been prepared from (+)-2-isopropyl-2-methylsuccinic acid. The absolute configuration of these acids has been defined as S by an X-ray crystallographic examination of (+)-rubidium 1-methyl 2-isopropyl-2-methylsuccinate.