An effective method for controlling 3,4-stereochemistry of aldols. Direct preparation of optically active 2,3-anti-3-hydroxy-2-methyl carbonyl compounds
Both 3,4-syn- and 3,4-anti-aldols can be prepared selectively from 2-methyl-3-trimethylsilylalk-3-enyl carbonylcompounds via 1,2-asymmetric induction; thus opticallyactive2,3-anti-3-hydroxy-2-methylcarbonylcompounds can be prepared by the reaction of opticallyactive (R)-2-methyl-3-trimethylsilylbut-3-enal (1) with the lithium enolate of 2,6-di-t-butyl-4-methylphenyl propionate.
Highly diastereofacial selective addition of nucleophiles to 2-alkyl-3-trimethylsilyl alk-3-enyl carbonyl compounds. Stereoselective preparation of β-methylhomoallyl alcohols and β-hydroxy-α-methyl ketones
作者:Fumie Sato、Masato Kusakabe、Yuichi Kobayashi
DOI:10.1039/c39840001130
日期:——
Nucleophiles react with 2-alkyl-3-trimethylsilylalk-3-enyl carbonylcompounds to afford ‘Cram’ products with high diastereoselectivity; this allows the stereoselectivepreparation of β-methylhomoally alcohols and β-hydroxy-α-methylketones.