Unexpected Cleavage of 2-Azido-2-(hydroxymethyl)oxetanes: Conformation Determines Reaction Pathway?
摘要:
An unanticipated cleavage of 2-azido-2-(hydroxymethyl)oxetanes is reported In attempts to oxidize the title oxetanyl alcohols to the corresponding carboxylic acids with RuO4, cleaved nitriles were formed as the sole isolable products, while a closely related tetrahydrofuran gave solely the expected carboxylic acid Quantum chemical calculations suggest that the divergent outcomes are governed by conformational differences in the azidoalcohols
Catalytic Asymmetric Synthesis of trans-Configured β-Lactones: Cooperation of Lewis Acid and Ion Pair Catalysis
作者:Thomas Kull、José Cabrera、René Peters
DOI:10.1002/chem.201000840
日期:——
development of the first trans‐selective catalytic asymmetric [2+2] cyclocondensation of acyl halides with aliphatic aldehydes furnishing 3,4‐disubstituted β‐lactones is described. This work made use of a new strategy within the context of asymmetric dual activation catalysis: it combines the concepts of Lewisacid and organic aprotic ionpaircatalysis in a single catalyst system. The methodology could
SYNTHESIS OF b-LACTONES AND ALKENES VIA THIOL ESTERS: (E)-2,3-DIMETHYL-3-DODECENE
作者:Danheiser, Rick L.、Nowick, James S.、Lee, Janette H.、Miller, Raymond F.、Huboux, Alexandre H.、Mathre, David J.、Shinkai, Ichiro
DOI:10.15227/orgsyn.073.0061
日期:——
A Highly Diastereoselective, Tandem Mukaiyama Aldol-Lactonization Route to β-Lactones: Application to a Concise Synthesis of the Potent Pancreatic Lipase Inhibitor, (−)-Panclicin D
作者:Hong Woon Yang、Daniel Romo
DOI:10.1021/jo9619488
日期:1997.1.1
Contact Ion Pair Directed Lewis Acid Catalysis: Asymmetric Synthesis of<i>trans</i>‐Configured β‐Lactones
作者:Thomas Kull、René Peters
DOI:10.1002/anie.200801143
日期:2008.7.7
Unexpected Cleavage of 2-Azido-2-(hydroxymethyl)oxetanes: Conformation Determines Reaction Pathway?
作者:Elisa Farber、Jackson Herget、José A. Gascón、Amy R. Howell
DOI:10.1021/jo101328c
日期:2010.11.19
An unanticipated cleavage of 2-azido-2-(hydroxymethyl)oxetanes is reported In attempts to oxidize the title oxetanyl alcohols to the corresponding carboxylic acids with RuO4, cleaved nitriles were formed as the sole isolable products, while a closely related tetrahydrofuran gave solely the expected carboxylic acid Quantum chemical calculations suggest that the divergent outcomes are governed by conformational differences in the azidoalcohols