Reductive Cleavage of Tetrahydrofuryl Sulfur-Substituted Oxiranes: Application to the Formal Synthesis of Kumausyne and Kumausallene
作者:Roberto Fernández de la Pradilla、Carolina Alhambra、Alejandro Castellanos、Jorge Fernández、Pilar Manzano、Carlos Montero、Mercedes Ureña、Alma Viso
DOI:10.1021/jo051459k
日期:2005.12.1
sulfonyl tetrahydrofuran methanol derivatives have been transformed efficiently into a variety of substituted tetrahydrofuryl alcohols by treatment with (PhSe)2 in the presence of an excess of NaBH4. Alternatively, oxirane cleavage with MgI2 produces the related ketones, amenable to stereocontrolled reduction. This reductive cleavage methodology has been applied to short formal syntheses of trans-Kumausyne
通过在过量的NaBH 4存在下用(PhSe)2处理,将现成的亚磺酰基和磺酰基四氢呋喃甲醇衍生物有效地转化为各种取代的四氢呋喃醇。或者,用MgI 2裂解环氧乙烷产生相关的酮,适合立体控制还原。该还原性裂解方法已用于反式-Kumausyne和Kumausallene的短形式合成。