Prepackaged Ramberg–Bäcklund reagents: useful tools for organic synthesis
作者:Eric Block、Hak Rim Jeon、David Putman、Shao-Zhong Zhang
DOI:10.1016/j.tet.2004.06.032
日期:2004.8
synthesis and reactions of several α,β-unsaturated chloromethyl sulfones is presented, for example [(chloromethyl)sulfonyl]-1,3-propadiene (4), [(chloromethyl)sulfonyl]ethene (5), [(dichloromethyl)sulfonyl]ethene (6) and (E,Z)-1,2-bis[(chloromethyl)sulfonyl]ethene (7). These compounds serve as ‘prepackaged’ Ramberg–Bäcklund reagents, which following an appropriate first step, such as Diels–Alder addition
A Relay Strategy Actuates Pre-Existing Trisubstituted Olefins in Monoterpenoids for Cross-Metathesis with Trisubstituted Alkenes
作者:Karim A. Bahou、D. Christopher Braddock、Adam G. Meyer、G. Paul Savage、Zhensheng Shi、Tianyou He
DOI:10.1021/acs.joc.0c00067
日期:2020.4.3
benzylidene catalyzed olefincross-metathesis with homoprenyl benzenes. Successful implementation of this approach provided several epoxypolyenes as expected (E/Z, ca. 2-3:1). The method is further generalized for the cross-metathesis of pre-existing trisubstituted olefins in other relay-actuated Δ6,7-functionalized monoterpenoid alcohols with various other trisubstituted alkenes to form new trisubstituted