Acid-Catalyzed Cyclization of Epoxyallylsilanes. An Unusual Rearrangement Cyclization Process
作者:Asunción Barbero、Pilar Castreño、Francisco J. Pulido
DOI:10.1021/ol035297v
日期:2003.10.1
synthesis of epoxyallylsilanes bearing the phenyldimethylsilyl group is reported that involves silylcupration of allene, conjugate addition to enones, and sulfur-ylide-mediated epoxidation. The Lewis acid-catalyzed cyclization of these substrates is presented. The expected normal products derived from 5-exo and/or 6-endo attack are not observed; instead, methylenecyclohexanols resulting from a tandem rea
Synthesis of 3-Methylenecyclohexan-1-ols by Lewis Acid Catalyzed Cyclization of (Epoxy-allyl)silanes
作者:Francisco J. Pulido、Asunción Barbero、Pilar Castreño
DOI:10.1002/ejoc.200901263
日期:2010.3
A newroute for the synthesis of (epoxy-allyl)silanes bearing the PhMe 2 Si group has been developed and their acid-catalyzed cyclization studied. The so-called normal products derived from 5-exo or 6-endo attack were never obtained. On the contrary, an interesting tandem rearrangement/cyclization process was observed, which selectively led to 3-methylenecyclohexan-1-ols. A mechanism is proposed to
已经开发了一种合成带有 PhMe 2 Si 基团的(环氧-烯丙基)硅烷的新途径,并研究了它们的酸催化环化。5-exo 或 6-endo 攻击衍生的所谓正常产物从未得到过。相反,观察到了一个有趣的串联重排/环化过程,它选择性地产生了 3-亚甲基环己-1-醇。提出了一种机制来解释这种串联反应。环化过程的立体选择性取决于催化剂的性质。
JOHNSTON, MADELINE I.;KWASS, JILL A.;BEAL, RICHARD B.;SNIDER, BARRY B., J. ORG. CHEM., 52,(1987) N 24, 5419-5424
作者:JOHNSTON, MADELINE I.、KWASS, JILL A.、BEAL, RICHARD B.、SNIDER, BARRY B.