C-H Functionalization of Amino Alcohols by Osmium Tetroxide/NMO or TPAP/NMO: Protecting Group-Free Synthesis of Indolizidines (-)-223AB and 3-<i>epi</i>
-(-)-223AB
作者:Wei-Lun Chen、Lee-Ya Wang、Yu-Jang Li
DOI:10.1002/ejoc.201901494
日期:2020.1.9
perruthenate, with NMO provide N,O‐acetal moieties by trapping the resulting iminium ion with the alcohol. These two transformations were demonstrated in the protecting group free synthesis of indolizidines (–)‐223AB and 3‐epi‐(–)‐223AB, compounds found in dart‐frog poison.
Diastereoselective Synthesis of Hexahydropyrrolo[2,1-b]oxazoles by a Rhodium-Catalyzed Hydroformylation / Silica-Promoted Deformylation Sequence
作者:Maxym Vasylyev、Howard Alper
DOI:10.1002/anie.200802550
日期:2009.2.2
Fleetingly formyl: A new rhodium‐catalyzed hydroformylation reaction of N‐allyl oxazolidines, carried out under a CO/H2 atmosphere, followed by a diastereoselective deformylative cyclization affords hexahydropyrrolo[2,1‐b]oxazoles in good yields. The reaction proceeds by a unique hydroformylation–deformylation sequence in which the formyl group virtually substitutes for the CH2O} fragment of the
迅速的甲酰基:在CO / H 2气氛下进行的新的铑催化的N-烯丙基恶唑烷的加氢甲酰化反应,然后进行非对映选择性的甲酰基化环化反应,可得到高产率的六氢吡咯并[2,1- b ]恶唑。通过其中甲酰基几乎替代为CH一个唯一的加氢甲酰化-脱甲酰序列反应进行2 ø}恶唑烷杂环的片段。