The development of new one-pot sequential cyclizations involving a Vilsmeier–Haack reaction followed by an organocatalyzed Mannich reaction is reported. This synthetic strategy gives access to functionalized indolizidines and quinolizidines in one operation from readily synthesized precursors. Yields and diastereoselectivities are good to excellent when formamides are used to trigger the key step,
[EN] PROCESS FOR PRODUCING ISOCYANATES<br/>[FR] PROCÉDÉ DE PRODUCTION D'ISOCYANATES
申请人:3M INNOVATIVE PROPERTIES CO
公开号:WO2011130032A1
公开(公告)日:2011-10-20
The invention relates a process for producing isocyanates comprising the steps of a) providing an azolide and optionally a solvent, and b) adding an acid at a temperature below about 40C. The invention also relates to the isocyanate obtainable by such a process.
Amine-Directed Hydroboration: Scope and Limitations
作者:Matthew Scheideman、Guoqiang Wang、Edwin Vedejs
DOI:10.1021/ja0774663
日期:2008.7.1
Iodine activation induces intramolecular hydroboration of homoallylic and bis-homoallylic amineboranes with good to excellent control of regiochemistry compared to control experiments using excess THF•BH3. Deuterium labeling and other evidence confirm that the iodine-induced hydroboration reaction of homoallylic amineboranes occurs via an intramolecular mechanism equivalent to the classical 4-center
The invention relates a process for producing isocyanates comprising the steps of a) providing an azolide and optionally a solvent, and b) adding an acid at a temperature below about 40°C. The invention also relates to the isocyanate obtainable by such a process.