Norpseudoephedrine-derived 2-methoxy-3-sulfonyl-1,3-oxazolidines: Chiral, highly diastereoselective formyl cation equivalents
作者:Kilian Conde-Frieboes、Dieter Hoppe
DOI:10.1016/s0040-4020(01)89849-5
日期:1992.1
(2S,4R 5R)-2-Methoxy-4-methyl-3-(4-methylbenzenesulfonyl)-5-phenyl-1,3-oxazolidine (2c) adds trimethylsilyl 1-cycloalkenyl ethers under Lewis acid catalysis with complete induced and high simple diastereoselectivity to yield homochiral oxazolidine-masked 2-formylalkanones.
(2S,4R,5R)-2-甲氧基-4-甲基-3-(4-甲基苯磺酰基)-5-苯基-1,3-噁唑烷(2c)在路易斯酸催化的条件下,与三甲基硅基-1-环烯基醚发生[3+2]环加成反应,具有完全的诱导性和高水平的简单非对映选择性,生成单一手性的噁唑烷保护的2-甲酰基烷酮。