Finally, reductive cleavage of the cobalt complex and hydrogenation of the double bonds afforded the target (+)-cis-lauthisan 72, αD25=+4.1(c 0.9, CHCl3). Sign in to download full-size image Scheme 8. The synthesis of polycyclic ethers with variable ring sizes can be conducted by two...
This method facilitates the construction of cis‐1,4‐silaketals (n=0, d.r.=20:1; see scheme), whereas the extension of this concept to higher alkenyl alcohols (n=1–4) results in a reversal of diastereoselectivity that favors formation of the trans isomer.doi:10.1002/anie.200250486...
First, we carried out the model reaction at 60 °C by using the aminomethyl cyclopalladated complex-A as the catalyst, the undesired non-cyclic allenic 1,5-diamine 4aa was obtained in 20% yield (Scheme 3A-1), which indicated that the palladium-catalyzed aminomethylamination reaction of ...
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describe a new approach to long-range asymmetric induction using the diastereoselective temporary silicon-tethered (TST) ring-closing-metathesis (RCM) reaction of mixed bisalkoxy silanes 1, derived from an allylic and prochiral alcohol, for the construction of cis-1,4-silaketals 2 (Scheme 1; n...
em@geus.dk; Tel.: +45-91-33-38-62 Received: 31 July 2017; Accepted: 3 October 2017; Published: 24 October 2017 Abstract: This article addresses a research gap on the challenges—specifically risk and value—connected to realizing the potential for closing loops for rare earth elements (REE...