A cationic iridium complex [Ir(cod)2]SbF6 was found to be a new and efficient Lewis acid catalyst for Mukaiyama aldol and Mannich reactions. Aldehydes react smoothly with silyl enol ethers to give β-siloxy ketones in the presence of 0.5 mol % of [Ir(cod)2]SbF6. The reaction of N-alkyl arylaldimines with ketene silyl acetals in the presence of 5 mol % [Ir(cod)2]SbF6/P(OPh)3 gave β-amino esters. After
Synthesis of β-lactams and β-aminoesters via high intensity ultrasound-promoted Reformatsky reactions
作者:Nathan A. Ross、Robert R. MacGregor、Richard A. Bartsch
DOI:10.1016/j.tet.2004.01.002
日期:2004.2
Reformatskyreactions of an imine, an α-bromoester, zinc dust and a catalytic amount of iodine in dioxane under high intensity ultrasound (HIU) irradiation from an ultrasonic probe are explored. A series of 16 aldimines with varying electronic demands is evaluated as potential electrophiles for reactions with three α-bromoesters of differing steric demands. This HIU method is successful for both enolizable
The reaction of α-chloroiminium chlorides with imines in which one of reagents contains a chiral substituent leads diastereoselectively to substituted β-lactams.
α-氯亚胺盐与其中一个试剂含有手性取代基的亚胺反应,选择性地形成取代的β-内酯。
2-Amino-1-azetines, a new class of strained amidines
The reaction of amide chlorides with N-benzhydrylimines yields azetidin-2-iminium salts, which, upon hydrogenolysis and treatment with base, are converted into 2-amino-1-azetines.
[2+2] Cycloaddition reactions of cationic iron vinylidene complexes
作者:Anthony G.M. Barrett、Michael A. Sturgess
DOI:10.1016/s0040-4039(00)83886-1
日期:1986.1
Complexes (Ph3P)(Cp)(OC)Fe+CCR12BF−4 underwent [2+2] cycloaddition reactions witn the imines MeNCHR2 to give the corresponding cationic iron (II) 2-azetinylidene adducts.