Unprecedented Nucleophilic Additions of Highly Polar Organometallic Compounds to Imines and Nitriles Using Water as a Non-Innocent Reaction Medium
作者:Giuseppe Dilauro、Marzia Dell'Aera、Paola Vitale、Vito Capriati、Filippo Maria Perna
DOI:10.1002/anie.201705412
日期:2017.8.14
inert atmospheres with dry volatile organic solvents and often low temperatures, the addition of highly polar organometallic compounds to non‐activated imines and nitriles proceeds quickly, efficiently, and chemoselectively with a broad range of substrates at room temperature and under air with water as the only reaction medium. Secondary amines and tertiary carbinamines are furnished in yields of up to
Development of highly enantioselective new Lewis basic N-formamide organocatalysts for hydrosilylation of imines with an unprecedented substrate profile
作者:Pengcheng Wu、Zhouyu Wang、Mounuo Cheng、Li Zhou、Jian Sun
DOI:10.1016/j.tet.2008.09.034
日期:2008.12
ketimines and non-methyl ketimines were catalyzed to afford the desired amines in good to high yield and enantioselectivity. In particular, catalyst 6e enabled the reduction of the difficult bulky ketimines to be highly efficient and enantioselective, affording up to 99% yield and 97% ee. This catalyst proved to prefer the relatively bulkier non-methyl acyclic ketimines to the methyl ketimines as substrate
1,2-Arylmigration of α,α-diaryl tertiary azides was achieved by using the catalytic system of FeCl2/N-heterocyclic carbene (NHC) SIPr·HCl. The reaction generated aniline products in good yields after one-pot reduction of the migration-resultant imines.
The chemistry of alkylstrontium halide analogues was examined. In the presence of metallic strontium, the Barbier-type alkylation of imines with alkyl iodides proceeded smoothly at room temperature under an argon atmosphere to afford the corresponding alkylated amines in good yields.
Regio- and stereoselective double alkylation of β-enamino esters with organolithium reagents followed by one-pot reduction: convenient method for the synthesis of tertiary γ-amino alcohols
stereoselective procedure for the preparation of tertiary γ-amino alcohols starting from β-enamino esters is presented. In this procedure, the double alkylation of β-enamino esters with organolithium reagents is followed by one-pot reduction with sodium borohydride in methanol/acetic acid. A hypothesis of mechanism is given, explaining the observed diastereoselectivity through molecular modeling. The configuration
提出了一种简单,高产且立体选择性的方法,该方法可从β-烯胺酯开始制备叔γ-氨基醇。在该方法中,用有机锂试剂对β-烯胺酯进行双烷基化,然后用硼氢化钠在甲醇/乙酸中一锅还原。给出了机理的假设,通过分子建模解释了观察到的非对映选择性。产物的构型通过1 H NMR光谱结合构象分析确定。