Formation of pyridin-4(1H)-one versus 1H-azepin-4(7H)-one by treatment of 4-tert-butyldimethylsilyloxy-2-amino-1-aza-bicyclo[4.1.0]hept-3-enes with tetrabutylammonium fluoride
摘要:
Cycloadducts 3 and 4 were treated with tetrabutylammonium fluoride and rapidly suffer cleavage on the three-membered ring to form either pyridin-4(1H)-one or 1H-azepin-4(7H)-one. When R-1 is an oxycarbonyl or a 2-pyridyl group and R-2 is a negative charge-stabilizing group (cases 3a,b and 4f) the C-C bond cleaves forming products 5. However, when R-2 = H (case 3c) the ring expands to seven members. When R1 is an acyl group the pyridin-4(1H)-one formation includes an unexpected shift of the carbonyl group. (c) 2007 Elsevier Ltd. All rights reserved.
合成这些 d'heteryl-4 butene-3ones-2(A) par 反应 AE de benzosulfinyl-4 butene-3one-2 avec des furanes, pyrroles, imidazole, pyrazole et dimethylamino-6 fulvenes; par add de Diels Alder les composes A sont ensuite transformes en furo [3,4-f] benzofuranes et -indoles; 申请 a la 合成补骨脂和内酰胺通讯员 a partir de benzosulfinyl-1 heptene-1yne-6one-3
Organocatalytic Enantioselective Conjugate Alkynylation of β-Aminoenones: Access to Chiral β-Alkynyl-β-Amino Carbonyl Derivatives
作者:Jian-Fei Wang、Xin Meng、Chao-Huan Zhang、Chuan-Ming Yu、Bin Mao
DOI:10.1021/acs.orglett.0c02394
日期:2020.10.2
Readily available potassium alkynyltrifluoroborates were used for organocatalytic asymmetric conjugate alkynylation of beta-enaminones. The interception of a modified binaphthol catalyst and in situ generated organodifluoroboranes proved important to access functionalized beta-alkynyl-beta-amino carbonyls and derivatives with improved chemo-reactivity and enantio-induction. Mechanistic studies revealed the impact of molecular sieves on efficiency and stereocontrol. The products undergo additional functionalization to yield a diverse set of valuable beta-alkynyl-beta-amino carbonyl scaffolds.