(E)-3-Hydroxy-1-alkenyl p-tolyl sulfones (1) reacted with a hexafluoropropen-diethylamine adduct (PPDA) to afford alpha-fluoro-alpha-(trifluoromethyl)-beta-[(p-tolylsulfonyl)methyl]-gamma-lactones (2). This reaction is so stereoselective that only one diastereomer of 2 is detected in the reaction mixture. A plausible mechanism for this intriguing reaction is discussed. (C) 1997 Elsevier Science Ltd.
(E)-3-羟基-1-烯丙基二
甲苯 sulfonyl 化物 (1) 与六
氟丙二胺加成物 (P
PDA) 反应,生成 alpha-
氟基-α-( trifluoromethyl ) -beta-[(p-甲基苯 sulfonyl )甲基]-gamma-环状物 (2)。本反应如此立体选择性,反应体系中只能检测到产物 2 的一种对映异构。对于这一引人注目的反应,提出了一个合理的机制。 (C) 1997 Elsevier Science Ltd.