Stereoselective formation of quaternary carbon centres with chiral 3-sulfonyl-1,3-oxazolidines and titanium enolates
作者:Markus Brüggemann、Roland Fröhlich、Birgit Wibbeling、Christiane Holst、Dieter Hoppe
DOI:10.1016/s0040-4020(01)01150-4
日期:2002.1
The reaction of chiral 2-alkoxy-3-sulfonyl-1,3-oxazolidines and trichlorotitanium enolates was applied for the stereoselective construction of quaternary α-carbonyl stereocentres on cycloalkanones. The influence of different chiral 1,3-oxazolidines on the selectivity and yield of this reaction has been studied. 2-Alkoxy-3-sulfonyl-1,3-oxazolidines bearing one small group in the 4 position or two trans-arranged
手性2-烷氧基-3-磺酰基-1,3-恶唑烷与三氯钛烯醇酸酯的反应用于在环烷烃上立体选择性构筑季α-羰基立体中心。已经研究了不同的手性1,3-恶唑烷对该反应的选择性和收率的影响。已发现在4位带有一个小基团或在4位和5位带有两个反式基团的2-烷氧基-3-磺酰基-1,3-恶唑烷具有最佳效果。