Synthesis of Chiral Propargylamines, Chiral 1,2‐Dihydronaphtho[2,1‐b]furans and Naphtho[2,1‐b]furans with C‐Alkynyl N,N′‐di‐(tert‐butoxycarbonyl)‐aminals and β‐Naphthols
作者:Ningning Man、Yuming Li、Jiyang Jie、Hongyun Li、Haijun Yang、Yufen Zhao、Hua Fu
DOI:10.1002/chem.202102040
日期:2021.9.6
phosphoric acid-catalyzed in situ formation of N-(tert-butoxycarbonyl)-imines (N-Boc-imines) from the aminals, and 1,2-addition of β-naphthols to the N-Boc-imines. Chiral 1,2-dihydronaphtho[2,1-b]furans and naphtho[2,1-b]furans were prepared with satisfactory results when 10 mol% AgOAc and 20 mol% 2,6-lutidine or 1.2 equiv. of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) were added to the resulting chiral propargylamines
C-炔基N,N'-二-(叔丁氧基羰基)-胺与β-萘酚的手性磷酸催化偶联产生中等至高产率的手性炔丙胺,具有高至极好的对映选择性,其中反应经历了连续手性磷酸催化从胺醛原位形成N -(叔丁氧基羰基)-亚胺(N -Boc-亚胺),以及β-萘酚与N -Boc-亚胺的 1,2-加成。手性 1,2-二氢萘并[2,1 -b ]呋喃和萘并[2,1 -b当使用 10 mol% AgOAc 和 20 mol% 2,6-二甲基吡啶或 1.2 当量时,] 呋喃的制备结果令人满意。将1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)分别加入到所得手性炔丙胺溶液中。