Efficient method for preparation of N-methoxy-N-methyl amides by reaction of lactones or esters with Me2AlClMeONHMe·HCl
作者:Takeshi Shimizu、Katsuhisa Osako、Ta-i Nakata
DOI:10.1016/s0040-4039(97)00429-2
日期:1997.4
The reaction of a lactone or an ester with dimethylaluminum chloride and N, O-dimethylhydroxylamine hydrochloride provided an efficient method for preparation of N-methoxy-N-methyl amide.
The formation of benzoxacin-3-ones <i>via</i> intramolecular Nicholas reactions and synthesis of 8-membered heliannuols
作者:Brent St. Onge、James R. Green
DOI:10.1039/d1ob01395e
日期:——
reactions to give dehydrobenzoxacin-3-one-Co2(CO)6 complexes in good yields. Reductive decomplexation and subsequent manipulation allows the synthesis of (±)-heliannuol K methyl ether and the formal syntheses of (±)-heliannuol K, (±)-heliannuol A, and (−)-heliannuol L.
由炔丙基醚-Co 2 (CO) 6配合物产生的 γ-羰基阳离子进行分子内尼古拉斯反应,以良好的收率得到 dehydrobenzoxacin-3-one-Co 2 (CO) 6配合物。还原解络和随后的操作允许合成 (±)-heliannuol K 甲基醚和 (±)-heliannuol K、(±)-heliannuol A 和 (-)-heliannuol L 的正式合成。