.alpha.-Haloalkanesulfonyl bromides in organic synthesis. 5. Versatile reagents for the synthesis of conjugated polyenes, enones, and 1,3-oxathiole 1,1-dioxides
Complementary Regioselectivity in the Cu(I)-Catalyzed Diamination of Conjugated Dienes To Form Cyclic Sulfamides
作者:Richard G. Cornwall、Baoguo Zhao、Yian Shi
DOI:10.1021/ol102767j
日期:2011.2.4
This paper describes the regioselectivediamination of conjugated dienes using inexpensive Cu(I) as catalyst and N,N-di-tert-butylthiadiaziridine 1,1-dioxide as nitrogen source. The regioselectivity of diamination is likely due to dual mechanistic pathways which are greatly influenced by reaction conditions and the nature of the diene. A variety of useful internal and terminal cyclic sulfamides can
Methyltriphenoxyphosphonium iodide (MTPI); induced dehydration and dehydrohalogenation in aprotic solvents
作者:Charles W. Spangler、Douglas P. Kjell、Lori L. Wellander、Mary A. Kinsella
DOI:10.1039/p19810002287
日期:——
Methyltriphenoxyphosphoniumiodide (MTPI) is an effective dehydration and dehydrohalogenation reagent under mild conditions when 1,3-dimethylimidazolidin-2-one is used as an aprotic solvent in place of the more normally used hexamethylphosphoric triamide (HMPT). Since previously suggested mechanisms had proposed alcohol–HMPT interaction as an important mechanistic step, this result coupled with comparative
cycloguanidination process using CuCl as catalyst and diaziridinimines as the nitrogen source. A variety of conjugated dienes, trienes, and terminal olefins can be effectively diaminated under mild reaction conditions. For dienes and trienes, the reaction occurs at the terminal double bond with high regioselectivity.