A mild cyclodesulfurization of N-(2-hydroxyethyl)-N′-phenylthioureas to 2-phenylamino-2-oxazolines using TsCl/NaOH
摘要:
An efficient synthesis of 2-phenylamino-2-oxazolines 3 via cyclodesulfurization of N-(2-hydroxyethyl)-N ' -phenylthioureas 2 by a one-pot reaction using p-toluenesulfonyl chloride (TsCl) and NaOH in very good yields is described. (C) 2001 Elsevier Science Ltd. All rights reserved.
Investigation of the Mitsunobu Reaction of<i>N</i>-(2-Hydroxyethyl)-<i>N′</i>-Phenyl-Ureas
作者:Taek Hyeon Kim、Gue-Jae Lee、Mi-Hyun Cha
DOI:10.1080/00397919908086441
日期:1999.8
The Mitsunobu reaction of N-(2-hydroxyethyl)-ureas 1 using PPh3 and EtO2CN=NCO2Et led to the mixture of N- and O-alkylation products or a single isomer depending on the substrates.
Chiral Alkoxide-Functionalized Guanidinates from Ring-Opening Rearrangement of Aminooxazolinate Complexes
作者:Andrew L. Gott、Stuart R. Coles、Adam J. Clarke、Guy J. Clarkson、Peter Scott
DOI:10.1021/om0607649
日期:2007.1.1
Treatment of Cp*M(NMe2)(3) (M = Zr, Hf) with both achiral and optically pure chiral aminooxazoline proligands HL yields metastable aminooxazolinate half-sandwich diamide complexes [Cp*ML(NMe2)(2)]. These species undergo clean rearrangement via oxazoline ring-opening to carbodiimides followed by amide migratory insertion. The chiral-at-metal products contain tridentate alkoxide-functionalized guanidinates, as confirmed by X-ray diffraction. In some of the chiral ligand systems, single diastereomer samples can be prepared, either by direct reaction or after recrystallization. As a result of the chelate structure, no thermal conversion between diastereomers is observed. A mechanism leading to the observed diastereoselection involving an intramolecular CH-pi interaction in the major product is proposed.