Substrate scope and stereocontrol in the Rh(II)-catalysed oxyamination of allylic carbamates
摘要:
Application of a modified Du Bois protocol for rhodium-stabilised nitrenoid generation to a variety of allylic carbamates results in 4-acetoxymethyl-1,3-oxazolidin-2-one derivatives with moderate to high levels of stereocontrol. (C) 2014 Elsevier Ltd. All rights reserved.
Carbamoyl-oxyalkyl-phosphinic acid derivatives or mixtures thereof of the formula ##STR1## in which Z.sub.n is an n-valent, saturated C.sub.1 -C.sub.6 -hydrocarbon group, R.sub.1 is an optionally branched C.sub.1 -C.sub.6 -alkyl group, which group may be substituted by a halogen atom, or a phenyl group, R.sub.2 is an optionally branched C.sub.2 -C.sub.7 -alkylene group, a is zero to n-1 and n is an integer of from 1 to 4. These compounds can be prepared by reacting phosphonites of the formula II ##STR2## in the presence of radical-forming agents, with a carbamate of the formula III CH.sub.2 .dbd.R.sub.3 --O--CO--NH.sub.2 III in which R.sub.3 is an optionally branched C.sub.2 -C.sub.7 -alkylene group and is identical with the radical R.sub.2 containing one hydrogen atom less. The compounds are used as flame-retardants for textiles.
Condensation products of aldehydes and unsaturated ester amides
申请人:PITTSBURGH PLATE GLASS CO
公开号:US02385911A1
公开(公告)日:1945-10-02
Substrate scope and stereocontrol in the Rh(II)-catalysed oxyamination of allylic carbamates
作者:William P. Unsworth、Scott G. Lamont、Jeremy Robertson
DOI:10.1016/j.tet.2014.06.051
日期:2014.10
Application of a modified Du Bois protocol for rhodium-stabilised nitrenoid generation to a variety of allylic carbamates results in 4-acetoxymethyl-1,3-oxazolidin-2-one derivatives with moderate to high levels of stereocontrol. (C) 2014 Elsevier Ltd. All rights reserved.
Carbamate mediated 1,3-asymmetric induction. A stereoselective synthesis of acyclic 1,3-diol systems
作者:Masahiro Hirama、Mitsuko Uei
DOI:10.1016/s0040-4039(00)85825-6
日期:1982.1
A highly regio- and stereo-selective functionalization of homoallylic carbamates with iodine is reported. The reaction has been applied to the preparation of key 1,3,5-triol intermediate 2 employed in the synthesis of compactin (1).