Convenient Synthesis of 4-Methylene-2-oxazolidinones and 4-Methylenetetrahydro-1,3-oxazin-2-ones via Transition-Metal Catalyzed Intramolecular Addition of Nitrogen Atom to Acetylenic Triple Bond
Convenient Synthesis of 4-Methylene-2-oxazolidinones and 4-Methylenetetrahydro-1,3-oxazin-2-ones via Transition-Metal Catalyzed Intramolecular Addition of Nitrogen Atom to Acetylenic Triple Bond
O-Propargyl carbamates 1 undergo an intramolecular nucleophilic addition to acetylenic bond at the nitrogen atom to furnish 4-methylene-2-oxazolidinones 2 in good yields in the presence (Cu+ for R1 = p-toluenesulfonyl, Ag+ for R1 = acyl) or absence (for R1 = alkyl and aryl) of a transition metal catalyst.
O-丙炔基氨基甲酸酯1在氮原子上的炔键上进行分子内亲核加成,从而以高收率提供4-亚甲基-2-恶唑烷酮2(Cu + R 1 =对甲苯磺酰基,Ag + R 1 =酰基)或不存在(对于R 1 =烷基和芳基)的过渡金属催化剂。
AQUEOUS SYNTHESIS OF IODOPROPARGYL CARBAMATE
申请人:Troy Technology Corporation, Inc.
公开号:EP0938470B1
公开(公告)日:2001-09-26
US5693849A
申请人:——
公开号:US5693849A
公开(公告)日:1997-12-02
[EN] AQUEOUS SYNTHESIS OF IODOPROPARGYL CARBAMATE<br/>[FR] SYNTHESE AQUEUSE D'IODOPROPARGYL CARBAMATE
申请人:TROY CORPORATION
公开号:WO1998018756A1
公开(公告)日:1998-05-07
(EN) This invention is directed to a method for making an iodopropargyl carbamate in an aqueous reaction medium so as to yield a more pure and stable, e.g., U.V. resistant, product in a high yield, free from environmental hazards posed by using non-aqueous solvents as the reaction medium.(FR) Cette invention concerne un procédé de fabrication d'un iodopropargyl carbamate dans un milieu réactionnel aqueux, ce procédé permettant d'obtenir un iodopropargyl carbamate plus pur et plus stable, par exemple résistant aux UV, et produit à un haut rendement, ne constituant plus un risque pour l'environnement comme les solvants non aqueux utilisés comme milieu réactionnel.
Convenient Synthesis of 4-Methylene-2-oxazolidinones and 4-Methylenetetrahydro-1,3-oxazin-2-ones via Transition-Metal Catalyzed Intramolecular Addition of Nitrogen Atom to Acetylenic Triple Bond
作者:Yoshinao Tamaru、Masanari Kimura、Shuji Tanaka、Sigeru Kure、Zen-ichi Yoshida
DOI:10.1246/bcsj.67.2838
日期:1994.10
2-Propynyl tosylcarbamates 1 undergo cyclization smoothly by the catalysis of CuCl/Et3N or AgNCO/Et3N to furnish 4-methylene-2-oxazolidinones 2 in good yields. The similar cyclization of the N-acyl derivatives of 1 (PhCO, MeCO, EtOCO, etc.) is catalyzed effectively by AgNCO/t-BuOK. These reactions accommodate a variety of substituents at C1 and C3 of 2-propyn-1-ol and provide (Z)-2 as single stereoisomers. The scope of the cyclization of 3-butynyl carbamates is rather limited, and in general only N-tosyl derivatives of terminally unsubstituted 3-butyn-1-ols undergo cyclization to give 4-methylenetetrahydro-1,3-oxazin-2-ones in synthetically useful yields by the catalysis of AgNCO/Et3N or AgNCO/t-BuOK.