121190-40-7Relevant academic research and scientific papers
Non-carbonyl-stabilized metallocarbenoids in synthesis: The development of a tandem rhodium-catalyzed bamford-stevens/thermal aliphatic claisen rearrangement sequence
May, Jeremy A.,Stoltz, Brian M.
, p. 12426 - 12427 (2007/10/03)
A tandem rhodium-catalyzed Bamford-Stevens/Claisen rearrangement is presented. The tandem reaction uses Eschenmoser hydrazones for the in situ generation of non-carbonyl-stabilized diazo alkanes, which are presumably intercepted by Rh(II) catalysts to induce a 1,2-hydride migration. This sequence provides high levels of stereocontrol for the generation of simple acyclic (Z)-enol ethers. These enol ethers undergo either thermal or Lewis acid accelerated Claisen rearrangements to provide products of high diastereopurity. Also presented are cascade reactions, wherein a third chemical step occurs after the initial tandem sequence (i.e., Bamford-Stevens/Claisen/ene and Bamford-Stevens/Claisen/Cope). Copyright
THERMAL O -> C REARRANGEMENT OF N-PHENYL-ALLYLIMIDATES
Metz, P.,Mues, C.
, p. 6841 - 6854 (2007/10/02)
Properly substituted N-phenyl-allylimidates 1 are shown to undergo preferential O -> C sigmatropic rearrangement on heating.The diastereoselectivity of this reaction resembles the one observed in ortho ester Claisen rearrangements.
